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Defining stratigraphic oil and gas plays by modifying structural plays:A case study from the Xihu Sag,east China Sea Shelf Basin

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Energy Geoscience 2021年第1期2卷 41-51页

作者： Feng Ding Chunyu Xie Xinghai Zhou Cen Jiang Kun Li Lifeng Wan Pei Zhang Huawei Niu Shanghai Offshore oil and gas exploration and production Company SINOPECShanghai200120China

The study focuses on an area of relatively mature oil and gas exploration located in the western slope of the Xihu Sag,East China Sea Shelf *** stratigraphic oil and gas plays are introduced to replenish the shrinking prospect inventory in the *** reservoirs of these plays are traditional pay intervals of the Eocene Pinghu Formation and Baoshi Formation composed of tide-dominated delta front,tidal flat and delta front sand bar *** investigating conventional seismic data,seismic inversion volumes,and well log data,multiple tidal-influenced delta front channels,beach sand packages have been mapped out in different reservoir sand intervals of the Pinghu Formation and Baoshi *** recognize four types of stratigraphic terminations:channel flank pinch-outs,axial pinch-outs of sand-fills,channel mouth sand bar pinch-outs,and onlap pinch-outs for the Baoshi *** the depositional facies and relatively low sand-shale ratio of the reservoir formations favor the occurrence of stratigraphic *** closure mechanism of all these plays are similar to the traditional structure plays in the area:fault blocks or fault-bounded rollover anticlines,except that one or more closing faults are replaced by these stratigraphic *** small-sized closures should exist but the relatively large ones are centered around a major intra-slope rise,raising the exploration potential in this maturely explored *** new exploration drilling campaign has so far tested the play of delta front channel facies,with three out of four wells commercially *** play concepts open up a novel approach to identify new traps in the study area and many other rift basins with similar settings in eastern China.

关键词： East China Sea Xihu Sag Stratigraphic play Pinghu Formation

Carbon and hydrogen isotopic characteristics of natural gases from the Luliang and Baoshan basins in Yunnan Province, China

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Science China Earth Sciences 2006年第9期49卷 938-946页

作者： XU Yongchang1, LIU Wenhui2, SHEN Ping1, WANG Wanchun1, WANG Xiaofeng1, Tenger1, YAN Yaomin3 & LIU Ruobin3 1. Lanzhou Center of oil & gas Resources, Institute of Geology and Geophsics, Chinese Academy of Sciences, Lanzhou 730000, China 2. Research Institute of Petroleum exploration and production, SINOPEC, Beijing 100083, China 3. South branch of Petroleum exploration and production Company, SINOPEC, Kuming 650000, China Lanzhou Center of oil & gas Resources Institute of Geology and Geophsics Chinese Academy of Sciences Lanzhou China Research Institute of Petroleum exploration and production SINOPEC Beijing China South branch of Petroleum exploration and production Company SINOPEC Kuming China

The Luliang and Baoshan basins of Yunnan Province are two small-sizedcontinental oil/gas-bearing sedimentary basins, which were developed at the bases of theCarboniferous and Devonian systems during the Late Tertiary, covering an area of 325 km^2 and 254km^2, respectively. Since the 1990s, there have been discovered small-sized natural gas pools inthese two basins. The natural gases are composed mainly of hydrocarbon gases, with nonhydrocarbonsaccounting for less than 2%. Of the hydrocarbon gases, methane accounts for more than 99%, and thecomponents above C_2 account for less than 0.2%. On the basis of previous studies of geologicalbackground, the composition of natural gases and their carbon isotopic composition, it has beendefined that these two gas pools are of bacterial origin. In this work we have comprehensivelymeasured the carbon and hydrogen isotopic composition of natural gases from these two basins andhave gone into the details of the mechanism of gas generation. The δ^(13)C_1 values of naturalgases from the Luliang Basin are within the range of -72.1 per thousand - -73.3 per thousand, andthe δD_(CH_4) values, -242 per thousand - -234 per thousand, indicating that the bacterial gasgeneration is dominated by the way of CO_2 reduction. It has been evidenced that undercontinental-facies fresh water conditions there did occur the CO_2 reduction as a process ofbacterial gas generation. The δ^(13)C_1 values of natural gases from the Baoshan Basin are withinthe range of - 62.5 per thousand - -63.5 per thousand, and the δD_(CH_4) values, -252 per thousand- -260 per thousand. These isotopic characteristics are fallen into transitional phase of acetatefermentation and CO_2 reduction as defined by Whiticar et al. (1986). An important discovery in theLuliang Basin is the carbon isotopic composition of ethane of purely biogenetic origin, i.e., itsδ^(13)C_2 values are within the range of - 61.2 per thousand - - 66.0 per thousand. These carbonisotopic values have been r

关键词： bacterial gas, carbon and hydrogen isotope, CO2 reduction, acetate fermentation.

Intelligent prediction and integral analysis of shale oil and gas sweet spots

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Petroleum Science 2018年第4期15卷 744-755页

作者： Ke-Ran Qian Zhi-Liang He Xi-Wu Liu Ye-Quan Chen State Key Laboratory of Shale oil and gas Enrichment Mechanisms and Effective Development Beijing 100083China Key Laboratory of Shale oil and gas exploration &production SINOPECBeijing 100083China Sinopec Petroleum exploration and production Research Institute Beijing 100083China

Shale reservoirs are characterized by low porosity and strong anisotropy. Conventional geophysical methods are far from perfect when it comes to the prediction of shale sweet spot locations, and even less reliable when attempting to delineate unconventional features of shale oil and gas. Based on some mathematical algorithms such as fuzzy mathematics, machine learning and multiple regression analysis, an effective workflow is proposed to allow intelligent prediction of sweet spots and comprehensive quantitative characterization of shale oil and gas reservoirs. This workflow can effectively combine multi-scale and multi-disciplinary data such as geology, well drilling, logging and seismic data. Following the maximum subordination and attribute optimization principle, we establish a machine learning model by adopting the support vector machine method to arrive at multi-attribute prediction of reservoir sweet spot location. Additionally, multiple regression analysis technology is applied to quantitatively predict a number of sweet spot attributes. The practical application of these methods to areas of interest shows high accuracy of sweet spot prediction, indicating that it is a good approach for describing the distribution of high-quality regions within shale reservoirs. Based on these sweet spot attributes, quantitative characterization of unconventional reservoirs can provide a reliable evaluation of shale reservoir potential.

关键词： Shale reservoir Machine learning Support vector machine Sweet spot prediction

Sedimentary systems of the Oligocene Huagang Formation in the central anticline zone of the Xihu Depression,East China Sea Shelf Basin

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Energy Geoscience 2024年第1期5卷 275-282页

作者： Wenbo Zheng Guofeng Yin Li Sun Shuijian Wei Xiuping Wei Bo Niu Petroleum exploration and production Research Institute of SINOPEC Beijing100083China Shanghai Offshore oil&gas branch SINOPECShanghai200120China

The Xihu Depression is the largest hydrocarbon-bearing depression of the East China Sea Shelf Basin(also referred to as the ECSSB).However,the depositional systems and reservoir distribution of the Oligocene Huagang Formation in the Xihu Depression are still *** the guidance of sedimentology and stratigraphy,this study documented a marine-terrestrial transitional environment in the restricted bay setting of the Oligocene Huagang Formation through core description,well logging,and seismic data *** study also revealed that the Oligocene Huagang Formation is dominated by tidal delta,estuary,and gravity flow deposits in the central anticline zone of the Xihu *** new understanding of the sedimentary systems and the discovery of the transgressive gap in the eastern Diaoyu Islands uplift explain the origin of fine-grained sediments and the EW-trending sand bodies in the central depression and the sand bodies parallel to shoreline in the west slope belt,which cannot be explained by previous study results,such as southern transgression or fluvial deltas and even lacustrine ***,the tidal channels,tidal sand flats,and gravity flow sand bodies formed by the transgressive tides are high-quality *** study will provide a basis for well placement and serve as guidance for the selection of favorable hydrocarbon exploration areas in the Xihu Depression.

关键词： Estuary Sedimentary system Oligocene Huagang Formation Central anticline Xihu Depression East China Sea Shelf Basin

Ordovician reservoirs in Fuxian area:gas accumulation patterns and their implications for the exploration of lower Paleozoic carbonates in the southern Ordos Basin

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Energy Geoscience 2024年第1期5卷 63-71页

作者： Ning Gu Juntao Zhang Xiaohui Jin Fei Yang Lu Liu Petroleum exploration and production Research Institute SINOPECBeijing102206China Huabei oil&gas branch SINOPECZhengzhouHenan450000China

In recent years,the Fuxian area in the southeastern Ordos Basin has undergone significant exploration,with industrial gas flow tested in wells drilled into the Ordovician marine *** this,the gas accumulation patterns of this area are not fully understood,posing challenges for further *** analysis of geological conditions indicates that the Ordovician Majiagou Formation in this area hosts two gas plays:one found in weathering crusts and the other found in interior of the *** investigated various typical gas reservoirs in the area,focusing on differentiating the geological conditions and factors controlling gas accumulation in the weathering-crust and interior gas *** results suggest three primary gas accumulation patterns in the Majiagou Formation in the Fuxian area:(1)upper gas accumulation in weathering crusts,present in the high parts of landforms such as residual paleo-hills or buried paleo-platform(Pattern I);(2)the stereoscopic pattern with gas accumulation in both weathering crusts and strata interior,arising in high parts of landforms such as residual paleo-hills or buried paleo-platforms(Pattern II);(3)lower gas accumulation in strata interior,occurring in the upper reaches and on both sides of paleo-trenches(Pattern III).This study will serve as a geological basis for future exploration deployment in the Fuxian area.

关键词： gas accumulation Ordovician Weathering crust play Interior play Fuxian area The ordos basin

exploration of Complicated oil and gas Fields

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Acta Geologica Sinica(English Edition) 1989年第1期63卷 65-77页

作者： Zhang Xiangning China National oil & gas exploration & Development Corporation, Beijing Liu Linqun China National oil & gas exploration & Development Corporation Beijing

Complicated oil and gas fields occupy an important position in oil and gas exploration. In this paper, complicated oil and gas fields are grouped into four types: fault-block, lithologic, stratigraphic and fissure types. On the basis of the new theory of petroleum geological exploration in composite oil and gas accumulation areas within continental basins, a new exploration sequence suitable for complicated oil and gas fields has been established, which comprises four stages:(1) initial exploration;(2) preliminary exploration;(3) early step-by-step exploration and development: and(4) late step-by-step exploration and development. The idea of cybernetics has been taken to control various links of a systematic exploration project so as to fully, effectively and comprehensively utilize the new exploration techniques, eventually realizing the optimization of exploration with the aim of raising the efficiency of exploration of complicated oil and gas fields.

关键词： Pro test exploration of Complicated oil and gas Fields

Pre-stack seismic density inversion in marine shale reservoirs in the southern Jiaoshiba area, Sichuan Basin, China

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Petroleum Science 2018年第3期15卷 484-497页

作者： Yuan-Yin Zhang Zhi-Jun Jin Ye-Quan Chen Xi-Wu Liu Lei Han Wu-Jun Jin oil and gas Survey China Geological Survey Beijing 100083 China State Key Laboratory of Shale oil and gas Enrichment Mechanisms and Effective Development Beijing 100083 China State Energy Center for Shale oil Research and Development Beijing 100083 China Sinopec Key Laboratory of Shale oil/gas exploration and production Technology Beijing 100083 China Petroleum exploration and production Research Institute Sinopec Beijing 100083 China

For a typical marine shale reservoir in the Jiaoshiba area, Sichuan Basin of China, P-impedance is sensitive for identifying lithology but not suitable for indicating good shale reservoirs. In comparison, density is an important quantity, which is sensitive for identifying the organic-rich mud shale from non-organic-rich mud shale. Due to the poor data quality and incidence angle range, density cannot be easily inverted by directly solving the ill-posed pre-stack seismic inversion in this area. Meanwhile, the traditional density regularizations implemented by directly using the more robust P-impedance inversion tend to be inaccurate for recovering density for this shale reservoir. In this paper, we combine the P-impedance and the minus uranium to construct the pseudo-P-impedance（PIp） at well locations. The PIp is observed to be sensitive for identifying organic-rich mud shale and has a good correlation with density in this area. We employ the PIp–density relation into the pre-stack inversion framework to estimate density. Three types of regularization are tested on both numerical and field data： These are no regularization, traditional regularization and the proposed approach. It is observed that the proposed method is better for recovering the density of organic-rich mud shale in the Jiaoshiba area.

关键词： Density inversion Pseudo-P-impedance Pure P-wave data Regularization

Fluid Geochemical Features and Preservation Conditions of Marine Stratum in Typical Structure of Jianghan Plain Area

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Journal of Earth Science 2011年第6期22卷 768-779页

作者：徐国盛龚德瑜袁海锋李昌鸿王国芝胡晓凤林娟华朱建敏 State Key Laboratory of oil and gas Reservoir Geology and Exploitation Chengdu University of Technology Institute of exploration and Exploitation Jianghan Oil Field Branch of SINOPEC

Many scholars carried out large quantity of researches on oil and gas preservative condi-tions of marine carbonate rocks from the aspects of cap rocks,faults,formation water,hydrodynamic,and *** article gives dynamic evaluation on oil and gas preservative conditions of marine stratum in Jianghan（江汉） plain of multiphase tectonic disturbance from the view of paleofluid *** conclusion shows that there mainly existed fluid filling of two periods in the reservoir of Lower-Middle Triassic to *** fluid filled in the earlier period came from Lower *** interchange of fluid in Lower-Middle Triassic to Permian suggested the oil and gas in Lower Pa-laeozoic had been broken *** fluid filled in the later period（Lower-Middle Triassic to Permian） came from the same or adjacent strata and lacked anatectic fluidogenous features coming from *** good preservative conditions of bulk fluid at the time,the fluid of Lower-Middle Triassic to Permian and that of Lower Palaeozoic did not connect with each ***,the hydrocarbon generation peak of marine source rocks had passed or the paleo-oil and gas reser-voirs had been destroyed at that time and the marine stratum of Palaeozoic to Triassic in the research area did not put out commercial oil and gas flow.

关键词： fluid geochemistry preservative condition of oil and gas marine stratum Jiang-han plain.

Key geological factors governing sweet spots in the Wufeng-Longmaxi shales of the Sichuan Basin,China

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Energy Geoscience 2024年第3期5卷 163-174页

作者： Zongquan Hu Zengqin Liu Wei Du Zhenrui Bai Ruyue Wang Chuanxiang Sun Dongjun Feng State Key Laboratory of Shale oil and gas Enrichment Mechanisms and Effective Development SINOPECBeijing102206China Key Laboratory of Shale oil/gas exploration and production Technology SINOPECBeijing102206China Petroleum exploration and production Research Institute SINOPECBeijing102206China

production performance of the Wufeng-Longmaxi shales varies significantly among Fuling,Weirong,and Wulong fields in the Sichuan *** organic carbon(TOC)content,mineralogy,and organic matter(OM)pore characteristics are investigated to identify key factors governing sweet *** shales with good preservation conditions in the Fuling Field exhibit large thickness,high TOC content and thin-section porosity(TSP),and well-developed OM macropores,thus high initial production and estimated ultimate recovery(EUR).Thin carbonate-containing siliceous shales with good preservation conditions in the Weirong Field feature medium-to-high TOC and well-developed OM macropores but low TSP,leading to high initial production but low *** shales with poor preservation conditions in the Wulong Field are characterized by large thickness,high TOC,low TSP and poorly-developed OM macropores,causing low initial production and *** sedimentary and preservation conditions are intrinsic decisive factors of sweet spots,as they control the mineral composition,TOC,and OM macropore ***-water shales in transgressive systems tracts(TSTs)exhibit better-developed OM macropores and greater TOC compared to highstand systems tracts(HSTs).OM macropores are most prevalent in siliceous shales,followed by carbonate-containing siliceous shales and then argillaceous ***,good preservation conditions are conducive to retain OM macropores with low pore aspect ratio(PAR).Comparison among the three fields shows that high-TOC silicious shales with good preservation conditions are the highest in TSP and ***,organic richness,lithofacies,and preservation conditions are the major factors which determine OM pore development,governing the sweet spots of the Wufeng-Longmaxi shales.

关键词： Shale gas Organic matter pores Sweet spot Wufeng-Longmaxi shales Sichuan basin