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Sedimentary Facies of Marine Shale gas Formations in Southern China： The Lower Silurian Longmaxi Formation in the Southern Sichuan Basin

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Journal of Earth Science 2016年第5期27卷 807-822页

作者： Yizhen Li Xingzhi Wang Bin Wu Guoqin Li Dule Wang State Key Laboratory of oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China Geological Exploration and Development Research Institute CNPC Chuanqing Drilling Engineering Company LimitedChengdu 610051China chongqing Mineral Resources Development company Limited Chongqing 400060China

Sedimentary facies is an important factor influencing shale gas accumulation. It not only controlls hydrocarbon generation, but also affects reservoir characteristics and distribution. This paper discusses the Lower Silurian Longmaxi Formation in the south of the Sichuan Basin. Outcrop, core, drilling and logging data identify the sedimentary facies of the formation as continental shelf facies, which is divided into two subfacies： an inner shelf and an outer shelf subfacies. These two subfacies can be further divided into seven microfacies： muddy silty shallow shelf, calcareous silty shallow shelf, muddy limy shallow shelf, storm flow, muddy deep shelf, silty muddy deep shelf and contour current microfacies. Vertical and horizontal distribution of microfacies establishes a sedimentation model of the continental shelf facies. Combined with analization or calculation of geochemical, mineralogical, physical and gas-bearing properties of samples, sedimentary microfacies is evaluated using nine parameters： total organic carbon content, effective shale continuous thickness, vitrinite reflectance, kerogen type, mineral components, porosity, permeability, water saturation and gas content. The evaluation revealed that the most favorable facies for shale gas exploration and development are the muddy deep shelf and part of the silty muddy deep shelf microfacies, with TOC more than 2%, siliceous component over 50%, clay less than 30%, porosity more than 3%, water saturation lower than 40%, gas content greater than 2 m3/t. These results provide a theoretical basis for deciston-making on the most promising areas for shale gas exploration in the Sichuan Basin and for marine shale gas exploration and development in South China.

关键词： Sichuan Basin shale gas Longmaxi Formation sedimentary facies continental shelf.

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Deployment and Exploration of a gas Storage Well Pattern Based on the Threshold Radius

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 630-637页

作者： TANG Ligen ZHU Weiyao ZHU Huayin SUN Chunhui YANG Fenglai WANG Yan Li Xiaorui Li Haiming CHU Guangzhen WANG Jieming KONG Debin YUE Ming LIU Yuwei HUANG Kun University of Science and Technology Beijing Beijing 100083China Research Institute of Petroleum Exploration and Development CNPCBeijing 100083China Petro China Liaohe oilfield company PanjinLiaoning 124000China Petro China Tarim oilfield company KorlaXinjiang 841000China Petro China southwest oil and gas Field company Chongqing 401121China

To tackle the problem that wells that are deployed in a specific pattern based on the requirements of gas reservoir development are not suitable for gas storage,we have conducted concentrically circular injection and production simulation experiments for gas storage,discovered the existence of a threshold radius,denoted by Rt,and derived the expression for Rt.Based on the analysis and discussion results,we propose a strategy for deploying gas storage wells in specific patterns.The expression for Rt shows that it is affected by factors such as the gas storage gas production/injection time,the upper pressure limit,the lower pressure limit,the bottomhole flow pressure at the ends of injection and production,the and permeability.The analysis and discussion results show that the Rt of a gas storage facility is much smaller than the Rt for gas reservoir development.In the gas storage facilities in China,the Rt for gas production is less than the Rt for the gas injection,and Rt increases with the difference in the operating pressure and with permeability K.Based on the characteristics of Rt,we propose three suggestions for gas storage well pattern deployment:(1)calculate Rt according to the designed functions of the gas storage facility and deploy the well pattern according to Rt;(2)deploy sparser,large-wellbore patterns in high-permeability areas and denser,small-wellbore patterns in high-permeability areas;and(3)achieve the gas injection well pattern by new drilling,and the gas production well pattern through a combination of the gas injection well pattern and old wells.By assessing a gas storage facility with a perfect well pattern after a number of adjustments,we found that the Rt of the 12 wells calculated in this paper is basically close to the corresponding actual radius,which validates our method.The results of this study provide a methodological basis for well pattern deployment in new gas storage construction.

关键词： gas storage well deployment strategy gas injection well pattern gas production well pattern threshold radius

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致密砂岩储层成岩相特征分析及测井识别

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测井技术 2018年第3期42卷 307-314页

作者：范宜仁李菲邓少贵陈智雍李格贤李俊秋中国石油大学(华东)地球科学与技术学院山东青岛266580 中国石油大学(华东)cnpc测井重点实验室山东青岛266580 中国石油西南油气田分公司重庆气矿重庆400021 中国石油集团测井有限公司陕西西安710077 黑龙江省地震局黑龙江哈尔滨150090

分析铸体薄片、扫描电镜、X衍射等资料,根据主要成岩作用和成岩矿物,将镇泾区块长8储层成岩相划分为强溶蚀压实相、碳酸盐胶结相、高岭石胶结相和不稳定组分溶蚀相,并研究了这4种成岩相的物性、胶结物含量、面孔率、孔隙结构、测井响应... 详细信息

分析铸体薄片、扫描电镜、X衍射等资料,根据主要成岩作用和成岩矿物,将镇泾区块长8储层成岩相划分为强溶蚀压实相、碳酸盐胶结相、高岭石胶结相和不稳定组分溶蚀相,并研究了这4种成岩相的物性、胶结物含量、面孔率、孔隙结构、测井响应等特征。在岩心归位的基础上建立胶结率、压实率、成岩综合系数与测井数据的对应关系,实现成岩相的定量表征。选取声波、密度、中子等对成岩相敏感的测井曲线,建立不同成岩相的判别标准,并通过最优化方法计算碳酸盐含量辅助识别,进一步提高成岩相测井识别的准确率。

关键词：测井解释成岩相胶结物含量面孔率孔隙结构定量表征镇泾区块

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