涪陵大安寨段致密石灰岩地层特征研究  

Study on characteristics of tight limestone strata of Da＇anzhai Member in Fuling, Chongqing

作　　者：刘海龙[1] 于秀英 LIU HaiLong;YU Xiu Ying(Sinopec Petroleum Exploration and Development Research Institute;Sulige South Operation Branch of PetroChina Changqing Oilfield Company)

机构地区：[1]中国石化石油勘探开发研究院 [2]中国石油长庆油田分公司苏里格南作业分公司

出　　处：《低渗透油气田》2018年第1期18-21,共4页

摘　　要：针对目前对涪陵大安寨段大一亚段致密石灰岩地层物性研究的不足，采用铸体薄片和扫描电镜相结合的方法，对涪陵大安寨段大一亚段致密石灰岩的沉积特征和储层特征进行了研究。研究表明：研究区主要为陆相滨浅湖一半深湖相沉积和滨浅湖（介壳滩）沉积环境。岩性以石灰岩为主，夹泥页岩薄层，顶部和底部泥质和砂质增多，属滨浅湖灰泥夹介壳层沉积。涪陵大安寨段大一亚段上部、下部的储层物性明显好于中部，上部由于有溶蚀发育裂缝导致其物性明显变好；下部由于有机质丰富，极大改善了储层的物性。研究证实：涪陵欠安寨段大一亚段致密石灰岩是一个良好的页岩气选区。In view of the insufficient study on the physical properties of the tight limestone strata in the Dal sub-Member of Da＇anzhai Member in Fuling, Chongqing, the sedimentary characteristics and reservoir features of limestone in the tight limestone strata in the Dal sub-Member of Da＇anzhai Member were studied by means of combination analysis of casting lamellae and scanning electron micrographs. The research results show that the study area is mainly sedimentary or depositional environments of continental facies onshore shallow - semi-deep lacustrine facies and onshore shallow lacustrine （shelly bank） facies. The lithology is dominated by limestone, intercalated with thin layers of shale/mudstone. To the top and bottom the argillaceous and arenaceous contents are increased, and it belongs to the sediments of shore shallow lacustrine limestone ＆ mudstone with testa/shells intercalated. In the Da＇anzhai Member of Fuling, vertically the physical properties of the upper and lower parts of the Dal sub-Member are significantly better than that of the middle part. In the upper part, due to the development of dissolution fissures, the physical properties of the reservoirs are significantly better; in the lower part, due to the rich organic matter, the physical properties of the reservoirs are greatly improved. It was confirmed by the research that the tight limestone in the Dal sub-Member of the Da＇anzhai Member in Fuling is a favorable selection area for shale gas.

关 键 词：涪陵大安寨段 沉积特征 储层特征 致密石灰岩 

分 类 号：P588.245[天文地球—岩石学]