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Types and genesis of sweet spots in the tight sandstone gas reservoirs:Insights from the Xujiahe Formation,northern Sichuan Basin,China

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Energy Geoscience 2022年第3期3卷 270-281页

作者： Yanqing Huang Ai Wang kaihua xiao Tian Lin Wujun Jin Petroleum Exploration and Production Research Institute SINOPECBeijing 100083China

Through comprehensively applying geological and geophysical data,as well as core and thin section observation,the characteristics of reservoirs and fractures in the second member of the Xujiahe Formation(hereinafter referred to as Xu2 Member)in the Yuanba area,northern Sichuan Basin,were *** with the analysis of the main controlling factors of production capacity,the types and characteristics of the sweet spots in the tight sandstone gas reservoir were *** evaluation standards and geological models of the sweet spots were *** results are as follows:(1)There are bedding-parallel fracture-,fault-induced fracture-,and pore-dominated sweet spots in the tight sandstone gas reservoirs of the Xu2 Member.(2)The bedding parallel fracture-dominated sweet spots have developed in quartz sandstones with well-developed horizontal fractures and *** are characterized by high permeability and high gas output during production *** kind of sweet spots is thin and shows a limited *** logging responses show extremely low gamma-ray(GR)values and medium-high AC ***,the bedding parallel fracture-dominated sweet spots can be mapped using seismic methods.(3)The fault-induced fracture-dominated sweet spots have welldeveloped medium-and high-angle shear *** logging responses show an increase in peaks of AC values and total hydrocarbon content and a decrease in ***,the areas with welldeveloped fault-induced fracture-dominated sweet spots can be effectively mapped using the properties such as seismic entropy and maximum likelihood.(4)The pore-dominated sweet spots are developed in medium-grained feldspathic litharenites with good reservoir *** are thick and widely distributed.(5)These three types of sweet spots are mainly determined by sedimentation,diagenesis,and *** bedding parallel fracture-dominated sweet spots are distributed in beachbar quartz sandsto

关键词： Sweet spot Evaluation standard Tight sandstone gas reservoirs Xujiahe Formation Yuanba area Northeastern Sichuan Basin

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Genetic mechanisms of high-quality tight siliciclastic reservoirs:A case study from the Upper Triassic Xujiahe Formation in the Yuanba area,Sichuan Basin,China

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Energy Geoscience 2024年第3期5卷 151-162页

作者： Ai Wang Junlong Liu Zhongqun Liu kaihua xiao Yanqing Huang Lingxiao Fan Jitong Li Petroleum Exploration and Production Research Institute SINOPECBeijing100083China

This study analyzed the petrological characteristics,diagenesis,pore types,and physical properties of the tight coarse-grained siliciclastic sequences in the third member of the Upper Triassic Xujiahe Formation(also referred to as the Xu-3 Member)in the western Yuanba area in the northeastern Sichuan Basin,China,based on the results of 242.61-m-long core description,292 thin-section observations,scanning electron microscopy(SEM),and 292 physical property *** types and genetic mechanisms of high-quality tight coarse-grained siliciclastic reservoirs in this member was determined *** research objective is to guide the exploration and development of the tight coarse-grained siliciclastic sequences in the Xu-3 *** results of this study are as *** types of high-quality reservoirs are developed in the coarse-grained siliciclastic sequences of the Xu-3 Member,namely the fractured fine-grained sandy conglomerate type and porous medium-grained calcarenaceous sandstone *** energy in the sedimentary environment is the key factor controlling the formation of high-quality *** high-quality reservoirs are developed mainly in the transitional zone with moderately high hydrodynamic energy between delta-plain braided channels and delta-front subaqueous distributary *** dolomitic debris(gravel)content is the main factor affecting the reservoirs’physical *** micritic algal debris and sandy debris in the dolomitic debris(or gravels)tend to recrystallize during burial,forming intercrystalline pores *** the medium-grained calcarenaceous sandstones,intercrystalline pores in the dolomitic debris are formed at the early diagenetic stage,and a pore system consisting of structural fractures connecting intergranular pores,intergranular dissolution pores,and kaolinite intergranular micropores is developed at the late stage of *** formation of intercrystalline pores in dolomite gravels and gravel-edge f

关键词： Tight siliciclastic rock High-quality reservoir Genetic mechanism Xujiahe Formation Northeast Sichuan

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Characterization of favorable lithofacies in tight sandstone reservoirs and its significance for gas exploration and exploitation: A case study of the 2nd Member of Triassic Xujiahe Formation in the Xinchang area, Sichuan Basin

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Petroleum Exploration and Development 2020年第6期47卷 1194-1205页

作者： LIU Junlong LIU Zhongqun xiao kaihua HUANG Yanqing JIN Wujun Sinopec Exploration&Production Research Institute Beijing 100083China

By using core,logging curves,and experiment data,favorable lithofacies types in the 2 nd Member of Triassic Xujiahe Formation in the Xinchang area,Sichuan Basin were classified,standard of the favorable lithofacies was established,planar distribution regularities of the favorable lithofacies were identified,and forming mechanisms of the favorable lithofacies and their control effect on production were examined.(1)The 2 nd Member of Xujiahe Formation has twelve types of lithofacies,among which multiple layer medium-coarse grain sandstone lithofacies,parallel bedding medium-coarse grain sandstone lithofacies,massive bedding medium-coarse grain sandstone lithofacies,inclined bedding medium-coarse grain sandstone lithofacies,and charcoal-bearing medium-coarse grain sandstone lithofacies with better physical properties and higher gas content are favorable lithofacies;they feature low gamma,low neutron porosity,low resistivity,and high acoustic travel time on logging curves.(2)The sedimentary process controls spatial distribution of sand bodies which are the material basis of the favorable lithofacies;post diagenetic fluids would differentially reconstruct the favorable lithofacies;tectonic activities and abnormal formation pressure made strata slide along the weakness plane,giving rise to fractures in different types of rocks,which can enhance the reservoir permeability significantly.(3)The development degree of favorable lithofacies is a major factor affecting stable production of gas well.

关键词： tight sandstone reservoir favorable lithofacies reservoir characterization Triassic Xujiahe Formation Xinchang area Sichuan Basin

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Sedimentary microfacies of Member 5 of Xujiahe Formation in the Dongfengchang area, Sichuan Basin

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Petroleum Research 2024年第3期9卷 481-488页

作者： Yanqing Huang Jian Wang Junlong Liu Nan Duan kaihua xiao Dawei Qiao Yan Li Ai Wang Sinopec Petroleum Exploration&Production Research Institute Beijing100083 China Sinopec Southwest Oil&Gas Company Chengdu610095SichuanChina

Member 5 of the Upper Triassic Xujiahe Formation(T_(3)X_(5))in central Sichuan Basin has made a breakthrough in exploration ***,this new stratum has not been investigated sufficiently with respect to basic geology,making its types and distribution of sedimentary facies unclear,which severely restricts its subsequent exploration *** this study,types of sedimentary microfacies in the first sand group of T_(3)X_(5)(T_(3)X_(5)^(1))are clarified through core observation and logging interpretation using core,log and seismic data,and then distribution of sedimentary microfacies in T_(3)X_(5)^(1) is determined according to seismic waveform features and seismic *** results show that T_(3)X_(5)^(1) in the Dongfengchang area is mainly composed of deltaic deposits of several microfacies,such as delta front underwater distributary channel,sheet sand,and interdistributary *** seismic sections,different microfacies are significantly different in waveform features,the underwater distributary channel is characterized by one trough between two peaks,while diversion bay exhibits chaotic reflections between T6 and *** sedimentary microfacies varied greatly during the depositional period of T_(3)X_(5)^(1) in the Dongfengchang area,this is because that the sediment supply was mainly controlled by the southwest and southeast provenance *** superimposed underwater distributary channels are developed in the Dongfengchang *** phase-1 superimposed underwater distributary channel in the northwest transition to sheet sand in the northeast,the phase-2 superimposed underwater distributary channel in the south extends shortly,the phase-3 superimposed underwater distributary channel in the northeast has a large development *** research findings are helpful to guide the subsequent exploration of T_(3)X_(5) gas reservoir and also theoretically significant for investigating the depositional evolution of the Xujiahe Formation in central Si

关键词： Seismic facies Sedimentary microfacies Xujiahe formation Upper triassic Dongfengchang area Central Sichuan Basin

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CEPR机组CRDM役前检查方案优化

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核动力工程 2020年第4期41卷 178-180页

作者：肖开华邵春兵中广核台山核电合营有限公司广东台山529228

某CEPR机组的控制棒驱动机构(CRDM)耐压壳安装完成后,发现此批次CRDM焊接见证件试验存在不合格样品。为缩短CRDM更换工期,降低对于项目整体进度的影响,在对CRDM耐压壳更换过程中通过深入研究役前检查规范,提出了一种新的役前检查策略。... 详细信息

某CEPR机组的控制棒驱动机构(CRDM)耐压壳安装完成后,发现此批次CRDM焊接见证件试验存在不合格样品。为缩短CRDM更换工期,降低对于项目整体进度的影响,在对CRDM耐压壳更换过程中通过深入研究役前检查规范,提出了一种新的役前检查策略。经实践表明,采用优化后的役前检查方案,在10 d内即完成了全部CRDM的离线役前检查,较最初的计划提前了约20 d;通过对安装后的部分CRDM进行超声和涡流检查,发现离线和在线检查结果一致,并且在线检查不存在可达性问题。

关键词：控制棒驱动机构(CRDM) 役前检查 CEPR

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中国南方志留系油气地质特征与勘探方向

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天然气工业 2009年第11期29卷 1-4页

作者：肖开华中国石化石油勘探开发研究院

中国南方志留系勘探程度较低,制约了对志留系自身油气成藏特点的研究和认识。从烃源岩的时空分布、优质烃源岩的发育环境、生烃史3个方面分析了中国南方上奥陶统—志留系的烃源条件;分析了志留系发育碎屑岩、碳酸盐岩两类储层的条件,对... 详细信息

中国南方志留系勘探程度较低,制约了对志留系自身油气成藏特点的研究和认识。从烃源岩的时空分布、优质烃源岩的发育环境、生烃史3个方面分析了中国南方上奥陶统—志留系的烃源条件;分析了志留系发育碎屑岩、碳酸盐岩两类储层的条件,对中国南方志留系油气成藏的基本特点进行了总结。该区上奥陶统—志留系优质烃源岩主要发育于上奥陶统五峰组和下志留统龙马溪组底部,以好—最好烃源岩为主,川东南—鄂西渝东区上奥陶统—下志留统烃源条件最好。上述两类储层均以低孔低渗—特低孔低渗为特征,其中,碎屑岩是主要的储集岩类。下志留统龙马溪组为优势盖层发育层位,是一套良好的区域性盖层。扬子区志留系泥岩具有较低孔隙度、较低渗透率、高突破压力、以超微孔为主的物性和孔隙结构特征,现今演化程度虽高,但仍具有良好的封盖能力。志留系天然气具油型气特征,并可能与储层中原油裂解成气有关,至少具有2期油气生成和运聚过程。结论认为:川东南—鄂西渝东区为志留系天然气勘探最有利区,江汉平原南部冲断褶皱区和下扬子海安地区则为勘探有利区。

关键词：成藏条件烃源岩成藏特点勘探方向中国南方志留系油型气

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四川盆地陆相烃源岩成熟史及生排烃史

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西南石油大学学报（自然科学版） 2015年第2期37卷 57-64页

作者：冯动军肖开华中国地质大学(北京)地球科学与资源学院北京海淀100083 中国石油化工股份有限公司石油勘探开发研究院北京海淀100083

为了综合评价四川盆地陆相烃源岩,应用含油气盆地数值模拟技术,定量恢复了研究区主要烃源岩层系的成熟和生排烃史。首先,分别建立了盆地的热力学、生烃动力学模式、机制及相关地质模型,其次,选取古热流值、沉积水表面温度、古水深作为... 详细信息

为了综合评价四川盆地陆相烃源岩,应用含油气盆地数值模拟技术,定量恢复了研究区主要烃源岩层系的成熟和生排烃史。首先,分别建立了盆地的热力学、生烃动力学模式、机制及相关地质模型,其次,选取古热流值、沉积水表面温度、古水深作为模拟参数,对四川盆地重点研究区20多口井进行了模拟。研究表明:四川盆地陆相系烃源岩具有3个生烃高峰期和两个排烃高峰期,成熟及生烃史总体表现为"分区演化、差异成熟、西早东晚"。层位上须三、须五段生、排烃量较大,其次为下侏罗统和须一段,总的排烃效率以须一段和须五段较高。平面上川西地区生烃量最大,其次为川北—川东北地区和川中地区。研究认为:以须家河组和中、下侏罗统为烃源岩的油气系统分别是川西地区和川北—川东北地区油气勘探的主要目标。

关键词：四川盆地须家河组侏罗统烃源岩成熟史生烃史排烃史

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Prospect of Sinopec's Exploration for Natural Gas

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China Oil & Gas 2008年第3期15卷 22-27页

作者： Long Shengxiang Zhu Hong Zhu Tong Chen Chunfang xiao kaihua Exploration and Production Research Institute Sinopec

Current state of Sinopec’s exploration for natural gasDistribution of exploration area and resource baseSinopec now owns the exploration right of 364 blocks, with the acreage about one million square kilometers. The ... 详细信息

关键词：中石化集团天然气勘探油气生产石油炼制

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川东北元坝地区须三段钙屑砂岩储层特征及控气因素

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石油与天然气地质 2014年第5期35卷 654-660页

作者：肖开华李宏涛贾爽中国石化石油勘探开发研究院北京100083

川东北元坝地区须家河组三段已获千亿方预测储量,具有良好的勘探开发潜力,但其储层特征及控气因素不明确。利用岩心、薄片、物性等分析测试资料,采用井震结合的方法,对该区须三气藏及主要目的砂组的储层特征及控气因素进行了研究。研究... 详细信息

川东北元坝地区须家河组三段已获千亿方预测储量,具有良好的勘探开发潜力,但其储层特征及控气因素不明确。利用岩心、薄片、物性等分析测试资料,采用井震结合的方法,对该区须三气藏及主要目的砂组的储层特征及控气因素进行了研究。研究认为,须三段以辫状河三角洲平原-三角洲前缘亚相沉积为主,钙屑砂岩具有碳酸盐岩岩屑含量高、石英含量低的特点,测井上显示低伽马、高电阻的特征。(含砾)钙屑砂岩储层总体上为特低孔-特低渗储层,储集空间类型多样,以溶蚀孔及其中的自生矿物晶间孔为主,(微)裂缝为辅;溶蚀孔隙主要分布于钙屑颗粒粒间,连通性好,是优质储层的最重要的储集空间。三角洲平原-前缘亚相的高能分流河道含砾钙屑砂岩、钙屑砂岩、砂砾岩有利岩相是天然气富集和高产的先决条件。沿层间发育的平缝和低角度缝及沿裂缝发育的溶蚀孔隙是天然气富集和高产的决定性因素,构造和断裂是天然气的富集和高产的重要条件。

关键词：控气因素沉积微相储层特征须家河组元坝地区四川盆地

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恒速压汞及核磁共振技术在四川盆地西部致密砂岩储层评价中的应用

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石油实验地质 2021年第2期43卷 368-376页

作者：冯动军肖开华中国石化石油勘探开发研究院北京100083

在深入分析恒速压汞法和核磁共振实验原理的基础上,结合岩心实验结果,分析川西新场地区上三叠统须家河组四段储集空间类型、孔隙结构类型、孔喉特征、孔喉比特征及其与孔、渗相关关系,研究孔隙和喉道对毛细管曲线的影响,探讨孔喉特征对... 详细信息

在深入分析恒速压汞法和核磁共振实验原理的基础上,结合岩心实验结果,分析川西新场地区上三叠统须家河组四段储集空间类型、孔隙结构类型、孔喉特征、孔喉比特征及其与孔、渗相关关系,研究孔隙和喉道对毛细管曲线的影响,探讨孔喉特征对可动流体参数的影响。川西须四段为低孔、低—超低渗致密储层,孔隙度介于1.6%~10.9%,平均5.9%,渗透率介于(0.01~2.81)×10^(-3)μm^(2),平均0.37×10^(-3)μm^(2)。发育粗喉大孔、粗喉小孔、细喉大孔和细喉小孔4类孔隙结构类型,孔隙半径介于8~180μm,平均112μm,以微孔—小孔为主;喉道半径介于0.100~1.008μm,平均0.484μm,以微喉为主。孔隙半径对低—超低渗储层的物性影响较小,喉道半径与渗透率相关性较好,其影响了毛细管曲线的变化,控制了低渗透储层的物性特征,是决定气藏开发效果的关键性因素。孔隙半径、喉道半径和最终进汞饱和度对可动流体参数影响较大,基于此三项参数提出孔隙结构指数,结合测井曲线开展了川西致密砂岩储层评价,评价结果与实际效果吻合较好。

关键词：恒速压汞核磁共振孔隙结构孔隙喉道可动流体须家河组川西

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