川中震旦系灯四段岩溶储集层特征与发育模式  

Characteristics and development model of karst reservoirs in the fourth member of Sinian Dengying Formation in central Sichuan Basin,SW China

作　　者：闫海军 何东博[2] 贾爱林[2] 李治平[1] 郭建林[2] 彭先[3] 孟凡坤[4] 李新豫 朱占美[3] 邓惠[3] 夏钦禹[2] 郑国强 杨山[3] 石晓敏[2] YAN Haijun;HE Dongbo;JIA Ailin;LI Zhiping;GUO Jianlin;PENG Xian;MENG Fankun;LI Xinyu;ZHU Zhanmei;DENG Hui;XIA Qinyu;ZHENG Guoqiang;YANG Shan;SHI Xiaomin(China University of Geosciences(Beijing),Beijing 100083,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;PetroChina Southwest Oil and Gas Field Company,Chengdu 610051,China;Yangtze University,Wuhan 430100,China)

机构地区：[1]中国地质大学(北京),北京100083 [2]中国石油勘探开发研究院,北京100083 [3]中国石油西南油气田公司,成都610051 [4]长江大学,武汉430100

出　　处：《石油勘探与开发》2022年第4期704-715,共12页Petroleum Exploration and Development

基　　金：“十三五”国家重大专项“复杂天然气藏开发关键技术”(2016ZX05015);中国石油天然气股份有限公司“十四五”前瞻性基础性科技项目“风化壳型碳酸盐岩气藏提高采收率技术研究”(2021DJ1504)。

摘　　要：基于钻井、录井、测井和地震等资料,系统分析四川盆地中部震旦系灯影组四段(简称灯四段)古老岩溶型碳酸盐岩储集空间特征、储集层类型和分布特征,构建岩溶储集层发育模式,支撑气藏实现高效开发。研究表明,灯四段储集层主要储渗空间为小尺度溶洞和裂缝,发育缝洞型、孔洞型和孔隙型3种储集层类型。明确岩溶储集层发育特征,平面上自岩溶台地到岩溶斜坡岩溶厚度由65 m增加到170 m,优质储集层厚度由25.0 m增加到42.2 m,纵向上灯四段顶部储集层多层展布,呈现顺层溶蚀和顺缝溶蚀特征,底部储集层存在3~5套规模较大的缝洞系统,呈现平行于岩溶期古水平面溶蚀特征。综合储集层发育特征,从成因机制出发,建立灯四段层溶体、缝溶体和面溶体3类储集层发育模式。构建3类岩溶储集层发育模式,明确其地震响应特征,为井位部署和轨迹设计提供参数依据,优化单井和气藏开发指标,气藏开发设计产能由初期的年产36×108 m^(3)提升到60×108 m^(3),大幅增加了气藏开发效益。The reservoir space,types and distribution characteristics of karst carbonate gas reservoirs in the fourth member of Sinian Dengying Formation(Deng 4 Member)in central Sichuan Basin are analyzed based on the drilling,logging and seismic data.A development model of karst reservoirs is constructed to support the high-efficiency development of gas pools.The research shows that the reservoirs in Deng 4 Member have mainly small-scale karst vugs and fractures as storage space,and can be divided into three types,fracture-vug,pore-vug and pore types.The development patterns of the karst reservoirs are determined.On the plane,the karst layers increase from 65 m to 170 m in thickness from the karst platform to the karst slope,and the high-quality reservoirs increase from 25.0 m to 42.2 m in thickness;vertically,the reservoirs at the top of Deng 4 Member appear in multiple layers,and show along-bedding and along fracture dissolution characteristics.The reservoirs at the bottom are characterized by the dissolution parallel to the water level during the karstification period,and have 3-5 large-scale fracture-cave systems.Based on the reservoir development characteristics and the genetic mechanism,three types of reservoir development models of karst reservoir are established,i.e.,bed-dissolved body,fracture-dissolved body and paleohorizon-dissolved body.The construction of karst reservoir development models and seismic response characteristics of the three types of reservoirs can provide parameter for well placement and trajectory design,and substantially improve productivity and development indices of individual wells and gas reservoirs.The designed production capacity of the gas reservoir has enhanced from the initial 3.6 billion to 6 billion cubic meters,making the profit of the reservoir development increase noticeably.

关 键 词：气藏特征 岩溶储集层 溶洞 层溶体 缝溶体 面溶体 发育模式 震旦系灯影组 四川盆地中部 

分 类 号：TE122.3[石油与天然气工程—油气勘探]