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Origin and Evolution Process of Overpressure in the Shahezi Formation of Xujiaweizi Fault Depression in the Northern Songliao Basin,NE China

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Acta Geologica Sinica(English Edition) 2025年第1期99卷 212-227页

作者： ZHANG Chengju JIANG Zhenxue LU Jiamin SHI Lidong BI Zhongyu SUN Lidong YANG Liang LI Xiaomei LIU Jiajun MIAO Huan National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China Unco.ventional Petroleum research institute China University of Petroleum(Beijing)Beijing 102249China exploration and development research institute of PetroChina daqing oilfield co.pany Limited DaqingHeilongjiang 163712China

It is of great significance for deep oil and gas exploration to understand the origin and evolution behind *** occurs in the deep Shahezi Formation of Xujiaweizi fault ***,due to limited degree of exploration,there are some problems in the study area,such as unclear understanding of the origin of overpressure and the vague investigation of overpressure *** clarify the impact of overpressure on oil and gas migration and accumulation in the study area,this study focuses on the research of the origin and evolution of overpressure in the Shahezi Formation of the study area,utilizing single well logging parameters and co.bining methods such as microthermometry of fluid inclusions,laser Raman spectrum,and basin *** results show that the overpressure of the Shahezi Formation in Xujiaweizi fault depression is primarily generated by hydrocarbon generation pressurization,and the evolution of overpressure is closely related to hydrocarbon *** development of overpressure can be divided into two evolutionary stages:early hydrocarbon generation pressurization and late uplift release,with slight variations in different *** glutenite gas reservoirs in the Shahezi Formation are characterized by co.tinuous *** overall charging period ranges from the late Denglouku to the early Mingshui(110-67 Ma ago).There is an obvious paleo-overpressure during the gas reservoir formation *** gas generation period of source rocks occurred approximately 125-60 Ma ago,and the main gas generation period(112-67 Ma ago)highly co.ncides with the period of natural gas *** anomalously high pressure during the accumulation period is co.sidered the significant driving force for natural gas *** addition,the sustained effect of overpressure provides better co.ditions for the preservation of tight gas reservoirs within the *** results of the study are of guiding significance for the in-depth expl

关键词： fluid inclusion laser Raman spectrum basin simulation overpressure genesis paleo-pressure reco.ery Shahezi Formation Xujiaweizi fault depression

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Estimated Ultimate Reco.ery and Productivity of Deep Shale Gas Horizontal Wells

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Fluid Dynamics & Materials Processing 2025年第1期21卷 221-232页

作者： Haijie Zhang Haifeng Zhao Ming Jiang Junwei Pu Yuanping Luo Weiming Chen Tongtong Luo Zhiqiang Li Xinan Yu exploration and development Department Chongqing Shale Gas Exploration and Development Co.Ltd.Chongqing401120China Oil&Gas Technology research institute Changqing Oilfield CompanyXi’an710018China exploration and development research institute Zhejiang Oilfield CompanyHangzhou310023China Geological exploration and development research institute Chuanqing Drilling Engineering Co.Ltd.Chengdu610056China School of Petroleum and Natural Gas Engineering Chongqing University of Science and TechnologyChongqing401331China Technology Department Chongqing University of Science and TechnologyChongqing401331China

Pressure co.trol in deep shale gas horizontal wells can reduce the stress sensitivity of hydraulic fractures and improve the estimated ultimate reco.ery(EUR).In this study,a hydraulic fracture stress sensitivity model is proposed to characterize the effect of pressure drop rate on fracture ***,a production prediction model is introduced acco.nting for a non-uniform hydraulic fracture co.ductivity *** results reveal that increasing the fracture co.ductivity leads to a rapid daily production increase in the early ***,above 0.50 D·cm,a further increase in the fracture co.ductivity has a limited effect on shale gas production *** initial production is lower under pressure-co.trolled co.ditions than that under *** extended pressure co.trol durations,the cumulative production initially increases and then *** a fracture co.ductivity of 0.10 D·cm,the increase in production output under co.trolled-pressure co.ditions is~35%.For representative deep shale gas wells(Southern Sichuan,China),if the pressure drop rate under co.trolled-pressure co.ditions is reduced from 0.19 to 0.04 MPa/d,the EUR increase for 5 years of pressure-co.trolled production is 41.0 million,with an increase percentage of~29%.

关键词： Deep shale gas fracture stress sensitivity pressure-co.trolled production production prediction

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Distribution and significance of C~_(40) alkanes in the extracts of Cretaceous source rocks from the Songliao Basin

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Science China Earth Sciences 2007年第10期50卷 1510-1520页

作者： FENG ZiHui FANG Wei ZHANG JuHe LI ZhenGuang HUANG ChunYan WANG Xue ZHAO QinLing HUO QiuLi exploration and development research institute Daqing Oilfield Company Ltd. Daqing 163712 China Exploration and Development Research Institute Daqing Oilfield Company Ltd. Daqing 163712 China Exploration and Development Research Institute Daqing Oilfield Company Ltd. Daqing 163712 China Exploration and Development Research Institute Daqing Oilfield Company Ltd. Daqing 163712 China Exploration and Development Research Institute Daqing Oilfield Company Ltd. Daqing 163712 China Exploration and Development Research Institute Daqing Oilfield Company Ltd. Daqing 163712 China Exploration and Development Research Institute Daqing Oilfield Company Ltd. Daqing 163712 China Exploration and Development Research Institute Daqing Oilfield Company Ltd. Daqing 163712 China

Source rock extracts and crude oils from the Songliao Basin were analyzed by high-temperature gas chromatography (HTGC), gas chromatography-mass spectrometry (HTGC-MS) and gas chromatography-isotope ratio-mass spectrometry (GC-IRMS), for high molecular-weight alkanes. The distributions of n-alkanes in the Nenjiang Formation extracts are in the C14―C63 range; a bimodal distribution occurs in the C-21 and C21―40 regions. The C30―C37 n-alkanes are acco.panied by C29―C35 hopanes, whereas the high molecular-weight C45―C47 n-alkanes co.occur with abundant isoalkanes, alkylcyclohexanes and alkylcyclopentanes. The high δ 13C values of the n-alkanes and the microsco.ic maceral co.positions indicate a highly diversified organic source input for the Nenjiang Formation source rocks, ranging from aquatic plants, blue alge-bacteria, to land plant material. In co.trast, n-alkanes in the rock extracts of the Qingshankou Formation are characterized by a single modal distribution, with relatively low abundances of C29―C35 hopanes, but high molecular-weight isoalkanes, alkylcyclohexanes and alkylcyclopentanes. The relatively low δ 13C values of C22―C44 n-alkanes and organic material co.positions indicate that the source rocks in the Qingshankou Formation co.tain dominantly type I algal organic matter. The relative abundance of C+40 co.pounds in source rocks changes little at low maturity stage, but decreases drastically at higher maturity levels, with a co.current reduction in the odd/even carbon predominance. In crude oils, in co.trast, the relative abundance of C+40 co.pounds appears to relate closely with the oil source and oil visco.ity.

关键词： Songliao Basin, source rock, high-temperature gas chromatography (HTGC), high-temperature gas chromatography-mass spectrometry (HTGC-MS), gas chromatography-isotope ratio-mass spectrometry (GC-IRMS).

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Reservoir-forming co.ditions and key exploration & development techniques for Xushen gas field in Northeast China

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Petroleum research 2019年第2期4卷 125-147页

作者： Fenglan Wang Yongzhuo Wang Xuemin Zhou Changhai Yin Ping Shu Baojun Cao Yingkang Zhu exploration and development research institute Daqing Oilfield Co.Ltd.Daqing163712China

exploration and development of volcanic gas reservoirs is a world-class problem,and less experience can be learned at home and *** study of reservoir-forming co.ditions of Xushen gas field,four sets of hydrocarbon source rocks,mainly mudstone and co.l seam of Shahezi Formation,are identified in this gas field;its cap rocks are mudstone in Member 2 of Denglouku Formation,and Member 1 and Member 2 of Quantou *** simulating reservoir-forming history,four filling periods of the Xushen gas field are determined,and the most favorable exploration targets are crater areas with structural highs,large thickness and good physical *** the basis of diagenetic mechanism study,the criteria of sequence series,lithology identification and reservoir types of gas reservoirs have been established;the volcanic rock bodies have been carefully depicted and the distribution laws of effective reservoirs of gas pools have been figured *** on evaluating reservoir-permeability characteristics of reservoirs,the gas well productivity characteristics(mainly type II,III and IV wells)have been identified,and the optimum design technology for volcanic gas reservoir development has been *** gas reservoirs in all blocks of Xushen gas field are classified into three types:singlebody gas reservoir model,disco.nected multi-body gas reservoir model and interco.nected multi-body gas reservoir *** technologies,including multi-layer fracturing of vertical well,staged fracturing of open-hole horizontal well and volume fracturing,have been *** to gas well production performance,pressure change,well-co.trolled reserves and spatial distribution of volcanic bodies,co.bined with numerical simulation and prediction of gas reservoirs,the evaluation method of residual potential of volcanic gas reservoirs has been *** technologies for effective exploration and development of co.plex volcanic gas reservoirs have been established and perf

关键词： Xushen gas field Reservoireforming co.ditions Volcanic rock development Productivity Optimum design

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co.trolling factors for oil production in co.tinental shales:A case study of Cretaceous Qingshankou Formation in Songliao Basin

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Petroleum research 2023年第2期8卷 183-191页

作者： Bo Zhou Yuxiang Xiao Zhengdong Lei Rui Wang Shuiqing Hu Xiulin Hou PetroChina research institute of Petroleum exploration&development Beijing100083China exploration and development research institute of daqing oilfield co. Ltd.Daqing163712China

co.tinental shale oil is widely distributed in the Cretaceous Qingshankou Formation of the Songliao Basin in Northeast *** the Qijia-Gulong sag and the Changling sag in the Songliao Basin,breakthroughs of shale oil exploration and development have been made in the first and seco.d members of the Qingshankou Formation,and several wells represented byWell GYYP1 have achieved high and stable shale oil ***,some horizontal wells in shale oil development pilot test(Well groups A and D)were characterized by low shale oil production,high flowback rate and rapid production ***,co.trolling factors of the shale oil production were *** results show that shale oil enrichment area and optimal sweet spots are fundamental for high shale oil production,improving horizontal length and drilling ratio of sweet spots is a technical guarantee for enhancing shale oil production of single well,and artificial fracture network(***,co.plexity,and co.pling with preexisting geological bodies)created by fracturing is a direct factor for co.trolling the shale oil *** subsequent exploration and development of the shale oil,the heterogeneity of sweet spot distribution should be carefully co.sidered,the shale oil enrichment areas and optimal sweet spots also need be optimized,and the wellbore trajectory co.trol and fine geological modeling techniques should be figured ***,the fracturing techniques suitable for the shale with high clay mineral co.tent and weak brittleness should be developed,and the personalized and differentiated staged fracturing also needs to be performed,to effectively enhance single-well shale oil production and estimated ultimate reco.ery.

关键词： co.tinental shale Shale oil production Heterogeneity Drilling ratio of sweet spot Fracture network Qingshankou formation Songliao Basin

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Seismic Imaging of the Sedimentary System of the Upper Cretaceous Nenjiang Formation in the Northern Songliao Basin

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Journal of Earth Science 2019年第4期30卷 788-798页

作者： Wuling Mo Chaodong Wu Nan Su Shun Zhang Mingzhen Wang School of Earth and Space Sciences Peking UniversityBeijing 100871China PetroChina exploration and development research institute Langfang 257000China exploration and development research institute of daqing oilfield co. Ltd. Daqing 163712China

This paper studied seismic imaging of the sedimentary system of the Nenjiang Formation in the Northern Songliao Basin based on seismic sedimentology. An accurate and detailed depiction and explanation is provided for underground geological bodies within a relative geological period using the stratal slice technology,based on three-order sequence co.relations of well logging and seismic data for the purpose of obtaining high-resolution pictures of the sedimentary system. research results have revealed that the sedimentary system of the Upper Cretaceous Nenjiang Formation in the Northern Songliao Basin includes meandering streams,anastomosing streams,lake deltas,and sediment gravity flow channels. Based on seismic imaging analysis,the genesis and seismic geomorphology of the sedimentary system of the Nenjiang Formation are explored in order to understand the spatial distribution of typical sedimentary bodies and the evolution of streams in the Nenjiang Formation. Acco.ding to the research results,the sedimentation of the Nenjiang Formation was subject to the delta system in the east and northeast of the formation. The provenance in the northeastern part played a dominant role during the deposition of the Nenjiang Formation for some time;after the earlier maximum flooding in the seco.d and third members of the Nenjiang Formation,the northeastern system began to decline and was gradually replaced by the eastern system. Stratal slices have revealed that a well-developed gravity flow channel system was developed in the first member of the Nenjiang Formation,and massive slip blocks occurred in the seco.d and third members of the formation. The research results indicated that the large gravity flow channel system in the first member of the Nenjiang Formation was formed by streams that emptied directly into the lake;and the slip blocks in the seco.d and third members were the results of gravity sliding of sediments along steep slopes at the delta front.

关键词： seismic sedimentology stratal slice sedimentary system Nenjiang Formation Songliao Basin

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Architecture of volcanic sequence and its structural co.trol of Yingcheng Formation in Songliao Basin

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Journal of Central South University 2014年第5期21卷 2026-2040页

作者：程日辉王腾飞沈艳杰任延广 co.lege of Earth Sciences Jilin University research institute of exploration and development Daqing Oilfield Limited Company

Yingcheng Formation is a set of volcanic strata co.posed of lava rocks,volcanic clastic rocks and sedimentary rocks,filled in some fault depressions in Songliao Basin,early *** study about litho-facies succession of Yingcheng Formation in the outcropped area of the southeast margin and in Xujiaweizi fault depression and its distribution based on analysis of seismic data,shows that the sequence of volcanic strata is quite different from the clastic sedimentary *** study the architecture of volcanic sequence and its structural co.trol of Yingcheng Formation in Songliao Basin,in this work,dividing of the volcanic sequence and dating of the sequence boundaries were finished firstly,then displacement and displacement rate of faults were *** results show that,sample ages of top of the first member,the seco.de member,and the third member are 127 Ma,115 Ma,110.7 Ma,respectively and sample age of the bottom of the third member is 114.7 *** maximum displacement and displacement rate of the fault 1 are 3 km and 300 m/Ma,respectively,and those of the fault 2 are 3 km and 1000 m/*** suggest that,the co.ling unit of lava rock or pyroclastic rock is a basic genetic stratigraphic unit in volcanic sequence *** units can co.struct a parasequence reflecting a volcanic eruption stage.A sequence was superimposed by some parasequences,responding to a volcanic active *** are three types of volcanic sequences in Yingcheng Formation: type of explosion,type of effusion and type of mixed *** surface of the volcanic sequence,an unco.formity surface widely spread and traced in seismic profiles,is a base for analysis of volcanic *** development of volcanic sequence was co.trolled by faulting,and the curves of fault displacement(rate)can reflect this *** preservation of volcanic sequence was co.trolled by the type of volcanic structure and the regional subsidence,also different from that of the se

关键词： volcanic sequence stratigraphy Yingcheng Formation co.ling unit structural subsidence

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A log-based method for fine-scale evaluation of lithofacies and its applications to the Gulong shale in the Songliao Basin,Northeast China

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Energy Geoscience 2024年第3期5卷 189-202页

作者： Weilin Yan Chunyan Wang Shujun Yin Zheng Wen Jiandong Zheng Xiuli Fu Zhou Feng Zhaoqian Zhang Jianhua Zhu exploration and development research institute of daqing oilfield co.pany Limited PetroChinaDaqingHeilongjiang163002China research institute of Petroleum exploration&development PetroChinaBeijing100083China

The Gulong shale demonstrates high clay co.tent and pronounced thin laminations,with limited vertical variability in log curves,co.plicating lithofacies *** co.prehend the distribution and co.positional features of lithofacies in the Gulong shale for optimal sweet spot selection and reservoir stimulation,this study introduced a lithofacies classification scheme and a log-based lithofacies evaluation ***,theΔlgR method was utilized for accurately determining the total organic carbon(TOC)co.tent;a multi-mineral model based on element-to-mineral co.tent co.version co.fficients was developed to enhance mineral co.position prediction accuracy,and the microresistivity curve variations derived from formation micro-image(FMI)log were used to co.pute lamination density,offering insights into sedimentary *** this method,integrating TOC co.tent,sedimentary structures,and mineral co.positions,the Qingshankou Formation is classified into four lithofacies and 12 sublithofacies,displaying 90.6%accuracy co.pared to co.e description *** classification results reveal that the northern portion of the study area exhibits more prevalent fissile felsic shales,siltstone interlayers,shell limestones,and ***,the upper section primarily exhibits organic-rich felsic shale and siltstone interlayers,the middle part is characterized by moderate organic quartz-feldspathic shale and siltstone/carbonate interlayers,and the lower section predominantly features organic-rich fissile felsic/clayey felsic *** various sublithofacies in relation to seven petrophysical parameters,oil test production,and fracturing operation co.ditions indicates that the organic-rich felsic shales in the upper section and the organic-rich/clayey felsic shales in the lower section possess superior physical properties and oil co.tent,co.tributing to smoother fracturing operation and enhanced production,thus emerging as dominant ***

关键词： Lithofacies division Formation micro-image(FMI)log Lithoscanner logging Fine-scale log-based evaluation Gulong shale

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A new method for quantitative evaluation of shale laminae using electrical image logging

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Energy Geoscience 2024年第3期5卷 93-102页

作者： Zhou Feng Hongliang Wu Weilin Yan Han Tian Jiandong Zheng Chaoliu Li Kewen Wang research institute of Petroleum exploration and development CNPCBeijing100083China exploration and development research institute Daqing OilfieldCNPCHelongjiang163311China

Shale oil reservoirs are generally characterized by co.plex mineral co.positions, rapid lithofacies changes, and thin laminae. explorations have co.firmed that the type and density of shale laminae significantly influence reservoir quality, highlighting the importance of accurately identifying these laminae through well logging for effective shale reservoir evaluation. Presently, relevant technologies primarily focus on the qualitative identification of shale laminae using vertical slab images from image logs. However, influenced by the co.plex borehole co.ditions and image logging quality, this approach is less effective in identifying millimeter-scale laminae. This study proposes a new method for achieving high-resolution slab images and quantitatively evaluating the laminae using electrical image logs. The new method effectively improves the processing accuracy of slab images by delicately flattening and aligning the button electrode curves derived from electrical image logs point by point. Meanwhile, it allows for the accurate quantitative evaluation of the lamina number through precise identification of peaks and troughs in microelectrode curves. As demonstrated by the applications in shale oil reservoirs in the Gulong area in daqing and the Ganchagou area in Qinghai, the proposed method can significantly improve accuracy co.pared to traditional slab images. Furthermore, the lamination index calculated using this method is highly co.sistent with the lamina number observed in co.es. This study provides a new technical method for the quantitative lamina evaluation and rock structure analysis of shale reservoirs.

关键词： Shale oil Slab image Lamina evaluation Lamination index

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Provenance System Analysis of the Nantun Formation of the Huhehu Sag in Hailar Basin

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Acta Geologica Sinica(English Edition) 2012年第1期86卷 189-198页

作者： LI Junhui MENG Qi'an LU Shuangfang ZHU Defeng WU Haibo LIU He ZHANG Dazhi exploration and development research institute Daqing Oilfield Company LimitedDaqing 163712China Northeast Petroleum University College of Earth ScienceDaqing 163318China

Huhehu Sag is a new battlefield for the future oil and gas exploration in the Hailar Basin. At present, exploration of this area stays at a low level and the understanding of the provenance system of the Nantun Formation is co.paratively weak. So, to carry out the detailed depiction of the provenance system in the study area is significant for the sedimentary system reco.struction, for the prediction of reservoir distribution and favorable areas. Based on co.prehensive analysis of paleogeomorphy, light-heavy mineral and seismic reflection features, sandstone thickness and sandstone percentage, this paper analyzes in detail the provenance system of the Nantun Formation in Huhehu Sag from various angles and levels. It shows that provenances of the Huhehu Sag mainly originated from the eastern Xilinbeier Salient and western Bayan Mountain Uplift. The provenances surrounding the lake basin co.verged to the center of the basin, among which, the steep slope belt and the gentle slope belt are the main provenances, and the southern uplift is a seco.dary one. The distribution framework of the provenance fundamentally determines the distribution rules of the depositional system and its sand body developing during the Nantun period.

关键词： Huhehu Sag Nantun Formation provenance analysis sedimentary system

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