川西地区雷口坡组第四段复杂气水分布多重控制因素  

The multiple control factors of complex gas and water distribution in the 4th Member of Leikoupo Formation in western Sichuan,China

作　　者：刘成川[1] 刘莉萍[1] 王启颖 陈丽花 高恒逸 LIU Chengchuan;LIU Liping;WANG Qiying;CHEN Lihua;GAO Hengyi(Exploration and Development Research Institute of SINOPEC Southwest Branch Company,Chengdu 610041,China)

机构地区：[1]中国石化西南油气分公司勘探开发研究院,成都610041

出　　处：《成都理工大学学报（自然科学版）》2020年第2期159-168,共10页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：中国石油化工股份有限公司重大科技攻关项目(P1611)。

摘　　要：探讨川西地区中三叠统雷口坡组第四段气藏复杂气水分布特征及其控制因素,为进一步的研究及天然气勘探提供方向。以钻井集中的金马-鸭子河构造及新场构造为例,通过动静结合的方法对比不同构造气藏构造、储层、流体及生产动态特征。川西雷四气藏气水分布特征复杂,气藏上、下储层受隔层阻挡,形成不同的气水系统,局部构造的现今构造位置控制气水分布;成藏期古构造控制区域气水分布,新场构造圈闭形成时期较晚,不利于油气聚集,而成为气水过渡带;储层具有强非均质性使气水分布不完全受构造控制,且可形成地压系数偏高的成岩圈闭;烃源丰度越高,气水界面更低,马鞍塘组-小塘子组及二叠系烃源是对雷口坡组烃源的有效补充。川西雷四气藏气水分布受古今构造、储层非均质性、烃源丰度等多重因素控制,局部构造相对高部位是勘探开发部署的首选区域,纵向上邻近烃源岩的储层为首选目标。The complex gas-water distribution characteristics and its control factors over the fourth Member of Middle Triassic Leikoupo Formation(T2l4)gas reservoir in western Sichuan are discussed and studied so as to provide direction for the exploration of natural gas.Correlation by dynamic and static combination is made for structures,reservoirs,fluids and production performance of different tectonic gas pools in the Jinma-Yazihe structure and Xinchang structure.It shows that the gas-water distribution is complex,and the upper and lower reservoirs of gas pool of the T2l4 in western Sichuan province are blocked by interlayer,and formed different gas-water systems.The present position of local structures controlled the distribution of gas and water,and the palaeo-structures of gasformation stage controlled the regional distribution of gas and water.Because the formation of Xinchang structure is relatively late,it is not conducive to the gas and water accumulation and forms gas-water transition zone instead.The distribution of gas and water is not completely controlled by structure due to the strong heterogeneity in the horizontal and vertical direction of reservoir,and the heterogeneity brings about diagenetic traps with high pressure coefficient.It reveals that the higher the abundance of hydrocarbon source is,the lower the gas-water interface.The hydrocarbon sources of Maantang Formation-Xiaotangzi Formation and Permian are effective supplements to the sources of Leikoupo Formation.Generally,the distribution of gas and water in the T2l4 gas reservoir in western Sichuan is controlled by multiple factors,such as ancient and modern structure,reservoir heterogeneity and hydrocarbon source abundance.The relatively high positions of the local structure are still the preferred areas for gas exploration and development.In vertical,the reservoir near the hydrocarbon sources is the first target for gas exploration.Gas and water cogeneration drilling should control the gas recovery rate and increase the degree of dissolved gas re

关 键 词：气藏特征 气水分布 控制因素 雷口坡组 四川盆地 

分 类 号：TE122.33[石油与天然气工程—油气勘探]