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A Model of Hydrothermal Dolomite Reservoir Facies in Precambrian Dolomite, Central Sichuan Basin, SW China and its Geochemical Characteristics

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Acta Geologica Sinica(English Edition) 2019年第1期93卷 130-145页

作者： GU Yifan ZHOU Lu JIANG Yuqiang JIANG Chan LUO Mingsheng ZHU Xun School of Geosciences & Technology Southwest Petroleum University Exploration division PetroChina Southwest Oil & Gas Field Company Shunan Division of Petrochina Southwest Oil&Gas Field Company Exploration and Development Institute of southwest oil&gas field company PetroChina

Hydrothermal mineral assemblages and related hydrothermally enhanced fracturing are common in the Precambrian Dengying Formation of Central Sichuan Basin. Petrographic and geochemical analyses of core samples show that the hydrothermal dolomite reservoirs of Dengying Formation consist of four main types of pores in the reservoir facies. These include: 1) hydrothermal dissolution vug(or pore), 2) intercrystalline pore, 3) residual inter-breccia vug(or pore), and 4) enlarged dissolved-fracture. There are three different fabrics dolomite in hydrothermal dolomite reservoirs, namely, saddle dolomite, fine-medium dolomite and micritic dolomite. Micritic dolomite is the original lithology of host rock. Saddle dolomite with curved or irregular crystal faces was directly crystallized from hydrothermal fluids(average temperature 192°C). Fine-medium dolomites are the products of recrystallization of micritic dolomite, resulting in abnormal geochemical characteristics, such as slight depletion of δ^(18)O, significant enrichment of Mn-Fe and ^(87)Sr/^(86)Sr, and positive Eu anomaly. A model for the distribution of various hydrothermal dolomite reservoir facies is proposed here, which incorporates three fundamental geological controls: 1) extensional tectonics and tectono-hydrothermal events(i.e., the Xingkai Taphrogenesis of Late Sinian-Early Cambrian, and Emei Taphrogenesis of Late Permian), 2) hydrothermal fluid storage in clastic rocks with large thickness(e.g., Nanhua System of Chengjiang Formation and part of Doushantuo Formation), and 3) confining bed for hydrothermal fluids(such as, the shale in Qiongzhusi Formation). The supply of hydrothermal fluid is critical. Large basement-rooted faults and associated grid-like fracture system may function as the channels for upward migration of hydrothermal fluid flow. The intersection of the above-mentioned faults(including the conversion fault), especially transtensional sags above negative flower structures on wrench faults can serve as a key target for future hydrocarbon expl

关键词： hydrothermal dolomite reservoir facies geochemical characteristics Precambrian Dengying Formation central Sichuan Basin

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Risk assessment of oil and gas pipelines hot work based on AHP-FCE

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Petroleum 2023年第1期9卷 94-100页

作者： San He Huilan Xu Jianxiong Zhang Peiqiang Xue southwest Petroleum University Chengdu610500China Sinopec southwest oil&gas company Chengdu610095China petrochina southwest oil and gas field company shunan gas Mine Luzhou64600China petrochina Qinghai oilfield Downhole Operation company Haixi Mongolian and Tibetan Autonomous Prefecture816100QinghaiChina

A new quantitative risk assessment method for hot work is proposed based on the analytic hierarchy process(AHP)and fuzzy comprehensive evaluation(FCE).It can help pipeline companies realize the risk management of hot work and further ensure the safe operation of oil and gas pipelines.Taking one natural gas pipeline in China as an example,this paper evaluates the risk of a single hot work in the spring of one natural gas pipeline in a high consequence region.First of all,the risk factors are determined with reference to the job safety analysis(JSA),and then experts were invited to fill out a questionnaire to collect their opinions.According to the results of the questionnaire,AHP is used to calculate the weight coefficients of the evaluation indicators,and FCE is used to evaluate the risk level of hot work.After calculation,the comprehensive risk score of hot work is 40.888.It belongs to a"general risk".This method can not only quantitatively evaluate the risk levels of hot work,but also reasonably sort the importance of various risk factors.It is helpful for the effective management of hot work and provides suggestions for implementing control measures.

关键词： oil and gas pipelines Hot work Risk assessment Analytic hierarchy process(AHP) Fuzzy comprehensive evaluation(FCE)

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Relationship between Permian volcanic rocks distribution and karst paleogeomorphology of Maokou Formation and its significance for petroleum exploration in western Sichuan Basin, SW China

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Petroleum Exploration and Development 2021年第3期48卷 670-682页

作者： LIU Ran LUO Bing LI Ya QIU Nansheng WANG Wei ZHANG Yu HE Qinglin PEI Senqi College of Geosciences China University of PetroleumBeijing 102249China Research Institute of Exploration and Development Southwest Oil&Gas Field Branch CompanyPetroChinaChengdu 610041China Exploration division of petrochina southwest oil&gas field company Chengdu 610041China Northwestern Camp in Sichuan Southwestern Oil&Gas field Branch CompanyPetroChinaJiangyou 621709China

Based on outcrop, drilling, logging, geochemical analysis and seismic data, the karst landform and distribution of Permian volcanic rocks at the end of the sedimentary period of the Maokou Formation in the western Sichuan Basin are examined, and their petroleum geological significance is discussed. Affected by normal faults formed in the early magmatic activities and extension tectonic background in the late sedimentary period of the Maokou Formation, a local karst shallow depression under the background of karst slope came up in the Jianyang area of the western Sichuan Basin, where the residual thickness of the Maokou Formation was thinner. Basic volcanic rocks like pyroclastic rock of eruptive facies, basalt of overflow facies, diabase porphyrite of intrusive facies and sedimentary tuff of volcanic sedimentary facies were formed after karstification. However, under the effects of faulting and karst paleogeomorphology, the volcanic rocks in different areas had different accumulation features. In the Jianyang area, with long eruption time, the volcanic rocks were thick and complex in lithology, and accumulated in the karst depressions. In the Zhongjiang-Santai area located in the karst slope, there’s no fault developed, only thin layers of basalt and sedimentary tuff turned up. The karst landform controls the build-up of thick explosive facies volcanic rocks and also the development of karst reservoirs in the Maokou Formation, and the western Sichuan area has oil and gas exploration potential in volcanic rocks and the Maokou Formation.

关键词： Sichuan Basin Permian Maokou Formation volcanic rocks Dongwu movement karst paleogeomorphology

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gas accumulation conditions and key technologies for exploration & development of Sinian and Cambrian gas reservoirs in Anyue gasfield

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Petroleum Research 2018年第3期3卷 221-238页

作者： Yueming Yang Yu Yang Guang Yang Jiarong Song LongWen Chuanguang Deng Maolong Xia Qi Ran Guobin Duan Bing Luo Bing Xie petrochina southwest oil&gas field company Sichuan610051China Research Institute of Exploration and Development PetroChina Southwest Oil&Gas Field CompanySichuan610051China Exploration division PetroChina Southwest Oil&Gas Field CompanySichuan610051China Chongqing Shale gas Exploration and Development Co. Ltd.Chongqing400023China

Exploration of the Sinian-Lower Paleozoic formations in the Sichuan Basin starts from the 1950s,and is tortuous and complex.To summarize the exploration experiences is of great significance of reference for exploration of oil and gas in deep carbonate rocks of the Sichuan Basin.gas accumulation in the Anyue oversize gasfield is chiefly controlled by the Deyang-Anyue intra-platform rift and central Sichuan paleouplift.The intra-platform rift controls the scale hydrocarbon generation center and effective hydrocarbon plays.The Anyue gasfield is characterized by near-source hydrocarbon accumulation.The marginal zone of intra-platform rift and high part of the paleouplift control the scale distribution of favorable facies belts of reservoir development,and overlapped by paleokarstic reformation,the reservoirs are widely distributed.The intra-platform rift and paleouplift jointly control formation of the scale traps and hydrocarbon enrichment.gas reservoir features and major controlling factors for hydrocarbon accumulation have some differences in the main play strata,such as Longwangmiao Formation,and Member 4 and Member 2 of Dengying Formation.The gas reservoir in the Longwangmiao Formation is a lithologic gas reservoir under the tectonic setting,and the inherited paleouplift is a key for reservoir formation and hydrocarbon accumulation.The gas reservoir in the Member 4 of Dengying Formation is mainly controlled by large structural-stratigraphic composite traps,and the gas reservoir in the Member 2 of Dengying Formation is the structural trap.Distribution of the large gasfields in the Dengying Formation is controlled by the intra-platform rift,near-source hydrocarbon-reservoir configuration controlled by the ancient erosion plane and stratigraphic sealing in the updip direction.For exploration and development of the Anyue gasfield,four series of technologies are developed,namely,reservoir seismic fine description technology,well logging fine evaluation technology of gas layers,fast drilling technology of complex stra

关键词： Anyue gasfield Dengying Formation Longwangmiao Formation gas reservoir feature Enrichment regularity Exploration and development technology

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Numerical Analysis of Dynamical Effects Associated with a Plugging String in a Horizontal Well

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Fluid Dynamics & Materials Processing 2023年第5期19卷 1203-1214页

作者： Guangsheng Liu Qingming Gan WenWu Haitao Yang Yiming Lv Wenhao Cui Wei Lin oil and gas Technology Research Institute Changqing oilfield company PetroChinaXi’an710018China National Engineering Laboratory for Exploration and Development of Low Permeability oil and gas fields petrochina Xi’an710018China shunan gas Mine PetroChina Southwest Oil and Gas Field CompanyLuzhou646000China College of Engineering Southwest Petroleum UniversityNanchong637001China

The finite element method has been applied to simulate the dynamics of a water plugging string in a complex horizontal well of a low-permeability oilfield.The force associated with the pipe string and the packer has been determined under the sucking action of the oil well pump.Such analysis has been conducted for a real drilling well,taking into account the process of lifting,lowering,unblocking and water plugging.Comparison between field measured data and simulation data indicates that the model is reliable and accurate.The packer creep effect under different pressure differences has also been investigated in the framework of the same model.

关键词： Water plugging string horizontal well creep effect mechanical water plugging

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Basin-Scale Sand Deposition in the Upper Triassic Xujiahe Formation of the Sichuan Basin, southwest China: Sedimentary Framework and Conceptual Model

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Journal of Earth Science 2013年第1期24卷 89-103页

作者：谭秀成夏青松陈景山李凌刘宏罗冰夏吉文杨家静 State Key Laboratory of oil and gas Geology and Exploitation Southwest Petroleum University School of Resource and Environment Southwest Petroleum University Research Institute of Exploration and Development PetroChina Southwest Oil and Gas Field Company Branch of shunan gas field PetroChina Southwest Oil and Gas Field Company

The Upper Triassic Xujiahe （须家河） Formation in the Sichuan （四川） Basin, southwest China is distinctive for the basin-scale sand deposition. This relatively rare sedimentary phenomenon has not been well interpreted. Here we addressed this issue by discussing sedimentary framework and conceptual model. Analysis of sedimentary setting implied that the basin received transgression during the deposition. It had multiple provenance supplies and river networks, as being surrounded by old- lands in multiple directions including the north, east and south. Thus, the basin was generally charac-terized by coastal and widely open and shallow lacustrine deposition during the Late Triassic Xujiahe period. This is similar to the modern well-known Poyang （鄱阳） Lake. Therefore, we investigated the framework and conceptual model of the Sichuan Basin during the Xujiahe period with an analogue to the Poyang Lake. Results show that the conceptual model of the deposition can be divided into transgressive and regressive stages. The first, third and fifth mem- bers of the formation are in transgressive stage and the deposits are dominated by shore and shallow lacustrine mud. In contrast, the deposition is mainly of braided river channel sand deposits during the regressive stage, mainly including the second, fourth and sixth members of the formation. The sand deposited in almost the entire basin because of the lateral migration and forward moving of the cross networks of the braided rivers. The multiple alternations of short and rapid transgression and relatively long regression are beneficial to the basin-scale sand deposition. Thus, the main channel of the braided river and its extensional areas are favorable for the development of hydrocarbon reservoir. This provides practical significance to the reservoir evaluation and exploration. In addition, the results also justify the relatively distinctive sedimentary phenomenon in the study area and may also have im- plications for understanding the large-scale sand deposition elsewhere.

关键词： basin-scale sand deposition coastal and widely open lake sedimentary framework sedimentary conceptual model channel of braided river Upper Triassic Xujiahe Formation Sichuan Basin.

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Reconstruction method of irregular seismic data with adaptive thresholds based on different sparse transform bases

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Applied Geophysics 2021年第3期18卷 345-360,432页

作者： Zhao Hu Yang Tun Ni Yu-Dong Liu Xing-Gang Xu Yin-Po Zhang Yi-Lei Zhang Guang-Rong Sichuan Key Laboratory of Natural gas Geology Southwest Petroleum UniversityChengdu 610500China School of Earth Science and Technology Southwest Petroleum UniversityChengdu 610500China CNPC Eastern Geophysical company Zhuozhou 072751China Branch of Chuanxibei gas field PetroChina Southwest Oil and Gas Field CompanyJiangyou621700China oil and gas Resources division PetroChina Southwest Oil and Gas Field CompanyChengdu 610041China

oil and gas seismic exploration have to adopt irregular seismic acquisition due to the increasingly complex exploration conditions to adapt to complex geological conditions and environments.However,the irregular seismic acquisition is accompanied by the lack of acquisition data,which requires high-precision regularization.The sparse signal feature in the transform domain in compressed sensing theory is used in this paper to recover the missing signal,involving sparse transform base optimization and threshold modeling.First,this paper analyzes and compares the effects of six sparse transformation bases on the reconstruction accuracy and efficiency of irregular seismic data and establishes the quantitative relationship between sparse transformation and reconstruction accuracy and efficiency.Second,an adaptive threshold modeling method based on sparse coefficient is provided to improve the reconstruction accuracy.Test results show that the method has good adaptability to different seismic data and sparse transform bases.The f-x domain reconstruction method of effective frequency samples is studied to address the problem of low computational efficiency.The parallel computing strategy of curvelet transform combined with OpenMP is further proposed,which substantially improves the computational efficiency under the premise of ensuring the reconstruction accuracy.Finally,the actual acquisition data are used to verify the proposed method.The results indicate that the proposed method strategy can solve the regularization problem of irregular seismic data in production and improve the imaging quality of the target layer economically and efficiently.

关键词： irregular acquisition seismic data reconstruction adaptive threshold f-x domain OpenMP parallel optimization sparse transformation

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构造及其差异沉降对川西北部地区梁山-栖霞组沉积环境的控制作用

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Journal of Central South University 2020年第11期27卷 3398-3416页

作者：钟原杨跃明文龙罗冰肖笛谭秀成赵立可李明隆 petrochina southwest oil and gas field company Exploration and Development Research Institute Chengdu 610041China division of Key Laboratory of Carbonate Reservoirs CNPCSouthwest Petroleum UniversityChengdu 610500China petrochina southwest oil and gas field company Chengdu 610051China School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China

在野外观察、岩心描述及测井分析的基础上,对川西北部地区梁山组-栖霞组的构造-沉积格架进行深入探讨。共划分出2个长期旋回LSC1、LSC2,建立了川西北部梁山-栖霞组层序地层格架,分析认为梁山组并非等时沉积。采用印模法恢复出LSC1沉积... 详细信息

在野外观察、岩心描述及测井分析的基础上,对川西北部地区梁山组-栖霞组的构造-沉积格架进行深入探讨。共划分出2个长期旋回LSC1、LSC2,建立了川西北部梁山-栖霞组层序地层格架,分析认为梁山组并非等时沉积。采用印模法恢复出LSC1沉积前古地貌、LSC1在古地貌高部位沉积厚度较薄的低能滩,而在低部位以厚度较大的滩间海、开阔海沉积为主。同时,采用残厚法恢复出LSC2沉积前古地貌,地貌高部位以较厚的高能滩相沉积为主,地貌低部位为较薄的滩间海、开阔海沉积。结果表明栖霞期已经发生了不同程度的构造差异沉降,东吴运动发生时间可能在目前认识上进一步提前,沉积前古地貌对层序地层充填和沉积相分布具有明显的控制作用。研究结果对精细刻画沉积演化过程和预测优质储层分布具有实际指导意义。

关键词：层序地层古地貌沉积相带栖霞组二叠系四川盆地西北部

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Evaluation on the anisotropic brittleness index of shale rock using geophysical logging

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Petroleum 2023年第4期9卷 545-557页

作者： Junchuan Gui Jianchun Guo Yu Sang Yaxi Chen Tianshou Ma P.G.Ranjith Research Institute of Shale gas PetroChina Southwest Oil and Gasfield CompanyChengdu610051China State Key Laboratory of oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China shunan gas Mine PetroChina Southwest Oil and Gas Field CompanyLuzhou646000China Downhole Service company CNPC Chuanqing Drilling Engineering Company LimitedChengdu610501China Deep Earth Energy Laboratory Department of Civil EngineeringMonash UniversityMelbourne3800Australia

The brittleness index plays a significant role in the hydraulic fracturing design and wellbore stability analysis of shale reservoirs.Various brittleness indices have been proposed to characterize the brittleness of shale rocks,but almost all of them ignored the anisotropy of the brittleness index.Therefore,uniaxial compression testing integrated with geophysical logging was used to provide insights into the anisotropy of the brittleness index for Longmaxi shale,the presented method was utilized to assess brittleness index of Longmaxi shale formation for the interval of 3155e3175 m in CW-1 well.The results indicated that the brittleness index of Longmaxi shale showed a distinct anisotropy,and it achieved the minimum value at β=45°-60°.As the bedding angle increased,the observed brittleness index(BI_(2_β))decreased firstly and increased then,it achieved the lowest value at β=40°-60°,and it is consistent with the uniaxial compression testing results.Compared to the isotropic brittleness index(β=0°),the deviation of the anisotropic brittleness index ranged from 10%to 66.7%,in other words,the anisotropy of brittleness index cannot be ignored for Longmaxi shale.Organic matter content is one of the main intrinsic causes of shale anisotropy,and the anisotropy degree of the brittleness index generally increases with the increase in organic matter content.The present work is valuable for the assessment of anisotropic brittleness for hydraulic fracturing design and wellbore stability analysis.

关键词： Shale rock Brittleness Brittleness index Anisotropy Transverse isotropy Geophysical logging

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Numerical simulation on proppant migration and placement within the rough and complex fractures

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Petroleum Science 2022年第5期19卷 2268-2283页

作者： Tian-Kui Guo Zhi-Lin Luo Jin Zhou Yuan-Zhi Gong Cai-Li Dai Jin Tang Yang Yu Bing Xiao Bao-Lun Niu Ji-Jiang Ge College of Petroleum Engineering China University of Petroleum(Huadong)Qingdao266580ShandongChina southwest oil and gas field company PetroChinaChengdu610051SichuanChina Exploration division Tarim Oilfield CompanyPetroChinaKorla841000XinjiangChina Dongxin oil Production Plant Shengli Oil Field BranchSinopecDongying257100ShandongChina Research Institute of Petroleum Exploration and Development PetroChinaBeijing100083China Zhongyuan Petroleum Engineering company SinopecPuyang457001HenanChina Zhongyuan oilfield company SinopecPuyang457001HenanChina

Hydraulic fracturing is a key technology for the development of unconventional hydrocarbon resources.The proppant placement morphology determines the fracture conductivity,thus affecting the reservoir stimulation effect.In this paper,the proppant migration and placement within complex fractures was studied by considering the fracture wall roughness through computational fluid mechanics-discrete element method(CFD-DEM)in numerical simulation,which is a key approach to study the proppant migration and placement.The results show that the proppant placement non-uniformity,proppant migration capacity,and proppant volume filled in the far-end and the secondary branched fracture are enhanced within the rough fracture compared with those within smooth fractures.The proppant migration capacity is increased within the fracture at low inclination angles(<60°)and low approach angles(<90°),and the proppant placement area is larger in the inclined fracture than that in the vertical fracture.The rise of injection rate and fracturing fluid viscosity causes more proppants migrate to far-end or secondary fractures,resulting in a non-proppant area within the near-wellbore fracture.An increase by 1.3 times in the injection rate and 3 times in the fracturing fluid viscosity leads to a decrease by 26.6%and 27%,respectively,in the proppant placement area within the near-wellbore fracture.The staged injection with small size proppants followed by large size proppants increases the proppant placement area in the primary fracture by 13%-26%,and that with large size proppants followed by small size proppants increases the proppant placement area by 19%-25%,which is due to that the latter method facilitates filling of the secondary branched fracture.The injection location mainly affects the proppant filling degree within the near-wellbore fractures.Compared with the upper injection,the middle and lower injection is not beneficial to filling of proppants within the near-wellbore fracture.

关键词： Hydraulic fracturing Proppant migration and placement Rough fracture wall Complex fracture CFD-DEM coupling

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