川中地区震旦系灯影组台内带优质储层识别及应用  

Identification and application of the gas reservoirs in the intra-platform of the Sinian Dengying Formation in central Sichuan Basin

作　　者：张明[1] 戴晓峰[1] 庞春晓 江林[2] 耿超 徐右平[1] ZHANG Ming;DAI Xiao-feng;PANG Chun-xiao;JIANG Lin;GENG Chao;XU You-ping(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;Southern Sichuan Gas District,PetroChina Southwest Oil&Gasfield Company,Luzhou 646000,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油西南油气田公司蜀南气矿,四川泸州646000

出　　处：《天然气地球科学》2021年第5期764-771,共8页Natural Gas Geoscience

基　　金：国家科技重大专项“岩性地层油气藏成藏规律、关键技术及目标评价”(编号:2017ZX05001);中国石油项目“地震储层预测质控软件系统集成研发”(编号:kt2020-10-05)联合资助.

摘　　要：川中地区震旦系灯影组台内带储层物性差、厚度薄,按台缘带储层划分标准,在台内带钻遇的储层厚度与钻井产量间没有明确的对应关系,极大地限制了灯影组台内带的勘探与开发。因此,开展了川中地区台内带优质储层划分,录井、测井、地震响应特征分析,以及储层预测方法研究。结果表明:洞穴型储层是台内带控制单井产量的关键因素,其录井响应表现为钻井过程中的井漏、放空等现象,测井响应特征为声波时差大于180μs/m、密度小于2.65 g/cm^(3)、成像图像上呈大面积暗色团块等。纵向上台内带洞穴型储层主要发育在灯影组顶部,地震响应特征表现为灯影组顶相对弱振幅、其下20 ms内多出现弱波峰。根据该认识,采用消除强反射屏蔽和属性融合技术,在GS19井区开展的储层预测结果与实钻结果非常吻合,并依据该储层预测结果部署了多批开发井,为川中地区灯影组台内带勘探与开发提供了新的思路。The reservoirs in the intra-platform of the Sinian Dengying Formation in the central Sichuan Basin are characterized by poor property and thin thickness. According to the reservoir classification standards of the marginal platform,there is no clear correspondence between the reservoir thickness and the drilling output in the intra-platform,which limits the exploration and development of the Dengying Formation. So we carried out the division of reservoirs in the intra-platform in central Sichuan Basin,the analysis of well logging and seismic response characteristics,and the study of reservoir prediction methods. The results show that the cave reservoir is the key factor for the intra-platform to control the well production. Logging response shows the phenomenon of leakage and blowout during the drilling process,and well log response features are characterized by acoustic time difference greater than 180 μs/m,density less than 2.65 g/cm^(3),and large dark clusters in the imaging image. The cave reservoirs in the intra-platform are mainly developed on the top of Dengying Formation. The seismic response is characterized by weak amplitude of Dengying Formation top and weak peak within 20 ms below it. According to this,using the technology of removing strong reflection and attribute fusion,the reservoir prediction carried out in the GS19 area is very consistent with the drilling results,and many development wells have been deployed. We provide a new idea for the exploration and development of the Dengying Formation in the central Sichuan area.

关 键 词：震旦系 灯影组 台内带 优质储层 洞穴 地震响应 

分 类 号：TE122.2[石油与天然气工程—油气勘探]