四川盆地中部磨溪气田中三叠统雷一1气藏储层特征及发育主控因素  

Reservoir Characteristics and Main Controlling Factors of the 1st Sub-Member of the 1st Member in Middle Triassic Leikoupo Formation of the Moxi Gas Field,Central Sichuan Basin

作　　者：李祖兵 李顺[2] 欧家强 易劲[2] 王小蓉[2] LI Zubing;LI Shun;OU Jiaqiang;YI Jin;WANG Xiaorong(Chongqing Key Laboratory of Exploration and Development of Complex Oil and Gas Fields,Chongqing 401331;Chuanzhong Oil and Gas Mine of Southwest Oil and Gas Field Company,Suining,Sichuan 629000;Southwest Oil and Gas FieldBranch,North Central Sichuan Gas Production Management Office,Suining,Sichuan 629000)

机构地区：[1]复杂油气田勘探开发重庆市重点实验室,重庆401331 [2]西南油气田分公司川中油气矿,四川遂宁629000 [3]西南油气田分公司川中北部采气管理处,四川遂宁629000

出　　处：《地质与勘探》2024年第5期1066-1080,共15页Geology and Exploration

基　　金：中石油创新基金(编号:2013D-5006-0104);重庆科技大学校内基金(编号:182402019)联合资助

摘　　要：为进一步明确四川盆地中部磨溪气田雷一1气藏的储层空间分布特征,以支撑该气藏下步的稳产挖潜和有利目标区域的优选,本文综合应用该气藏内65口取心井的岩心、11口井648个岩化分析、282块岩心的物性测试、416张铸体薄片、368个电镜扫描及82块高压压汞等资料,探究磨溪气田雷一1气藏储层特征及发育控制因素。结果表明:磨溪雷一1段储层发育于白云岩、灰质白云岩、砂屑云岩和云质灰岩中,储层主要分布于上亚段的中部、中亚段的底部和顶部;储层的储集空间类型多样,但以溶蚀作用形成的各类溶蚀孔隙为主;储层总体表现为中孔低渗的孔隙型储层,具有粗孔细喉、中孔微喉、微孔微喉等类型,但以中孔微喉和微孔微喉为主。储层发育主要受沉积作用、成岩作用及构造作用的控制。沉积过程形成的粗结构岩性的物性要好于细结构的岩性,胶结作用使先期形成的孔隙度减少了5%~95%,溶蚀作用使先期形成的孔隙空间增加3%~20%,白云化程度越高其物性较好。构造作用形成的低角度裂缝数量占绝对优势,未充填或部分充填的裂缝较完全被充填的裂缝多。未充填或部分充填的裂缝对储层发育的贡献较大,对储层的储集性能改善具有重要意义。This work attempts to further determine the reservoir spatial characteristics of the 1st sub-member of the 1st member in Middle Triassic Leikoupo Formation(Lei11)of the Moxi gas field in the central Sichuan Basin,and thus to support stable production and potential tapping,and the delineation of favorable target areas.A total of core samples from 65 coring wells,648 lithification analyses from 11 wells,physical property testing of 282 core samples,416 casting thin sections,368 electron microscopy scans,and 82 high-pressure mercury injection data were utilized to explore the reservoir characteristics and control factors in the Lei11 Formation of the Moxi gas field.Results show that the reservoir of Lei11 Formation is developed in dolomite,calcareous dolomite,sandstone dolomite,and dolomite limestone,and the reservoir is mainly distributed in the middle of the upper submember of the Lei11,and the bottom and top of the middle sub-member of the Lei11.The diverse reservoir space is dominated by dissolution pores due to dissolution.The reservoir is a porous type with middle porosity and low permeability,and displays coarse pore and fine throat,mesoporous and microthroat,and microporous micro-throat,with mesoporous micro-throat and microporous micro-throat being dominant.The development of reservoirs is mainly controlled by sedimentation,diagenesis,and tectonic processes.The physical properties of the coarse-grained lithology formed during the sedimentation are better than those of the fine-grained lithology.The cementation effect reduces the porosity formed in the early stage by 5%~95%,and the dissolution effect increases the pore space formed in the early stage by 3%~20%.The higher the degree of dolomitization is,the better the physical properties are.The number of low-angle cracks formed by tectonic activity is dominant,with more unfilled or partially filled cracks than fully filled cracks.Unfilled or partially filled fractures contribute significantly to reservoir development and greatly help to improve reservoir per

关 键 词：雷一1 气藏 储层特征 主控因素 中三叠统 磨溪气田 四川盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]