考虑基质孔缝特征的湖相致密灰岩类型划分——以四川盆地中部侏罗系自流井组大安寨段为例  

Classification of lacustrine tight limestone considering matrix pores or fractures: A case study of Da'anzhai Member of Jurassic Ziliujing Formation in central Sichuan Basin, SW China

作　　者：田泽普 宋新民[2,3] 王拥军[2] 冉启全[2] 刘波[3] 许启鲁 李扬[4] TIAN Zepu SONG Xinmin WANG Yongjun RAN Qiquan LIU Bo XU Qilu LI Yang(School of Earth ＆ Space Sciences, Peldng University, Beijing 100871, China PetroChina Research Institute of Petroleum Exploration ＆ Development, Beijing 100083, China Oil ＆ Gas Research Center, Peking University, Beijing 100871, China China University of Geosciences, Beij＇ing 100083, China)

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]中国石油勘探开发研究院,北京100083 [3]北京大学石油与天然气研究中心,北京100871 [4]中国地质大学(北京),北京100083

出　　处：《石油勘探与开发》2017年第2期213-224,共12页Petroleum Exploration and Development

基　　金：国家自然科学基金"深部碳酸盐岩油气储集层原位溶蚀模拟实验研究"(41272137);中国石油勘探开发研究院院级项目"四川盆地侏罗系大安寨段致密油储层模式与地质综合评价研究"(2016yj01)

摘　　要：为提高致密储集层甜点预测的准确度与精度,根据储集层基质孔缝特征及其与岩石组构的关系,将四川盆地中部侏罗系自流井组大安寨段岩性进行细分,据此讨论不同岩性的物性、含油性特征及其对产能特征的影响。大安寨段灰岩中发育大量、多类型的微—纳米孔缝。以介壳为主的生屑、方解石/白云石晶粒以及硅酸盐矿物为影响储集层基质孔缝的三端元组构。据此将研究区灰岩划分为10种类型,每种岩石类型对应独立的沉积成岩演化史和孔缝特征。含硅介壳灰岩、含泥介壳灰岩等储集性好;介屑灰岩、泥粉晶介屑灰岩渗流能力强;含泥介壳灰岩含油性好;含硅、含云、含泥介壳灰岩可增加单井产量。岩性差异是造成大安寨段单井产能差异的重要原因。To improve the prediction accuracy of sweet spots in tight reservoirs, the Da＇anzhai Member limestone in Jurassic Ziliujing Formation, central Sichuan Basin was subdivided based on the relationship between characteristics of matrix pores and fractures and rock fabric, and the physical properties and oiliness of every type and the effect of different rock types on the natural productivity were discussed. The limestone reservoir has plenty, multi-type nano-to micro-meter micropores or microfractures. Bioclastics which mainly are bivalve shells, calcite or dolomite crystalline grains and silicate minerals are the three endmembers affecting the development of micropores or microfractures in the limestones. According to this, the limestone in Da＇anzhai Member is subdivided into 10 different types, each with unique sedimentary and diagenetic history, and pore and fracture features. The study results show that siliceous bivalve packstone and clay bivalve packstone have better storage property; bivalve-clastic grainstone and bivalve mudstone have higher permeability; clay bivalve packstone has higher oil content; and siliceous shell packstone, dolomitic shell packstone and argillaceous shell packstone can increase the supply ability of reservoirs. Lithologic difference results in different pore-fracture and physical properties, which are the main reason of the different single well productivity in the Da＇anzhai Member.

关 键 词：致密灰岩 基质孔缝 岩石类型 物性 含油性 产能特征 大安寨段 侏罗系 

分 类 号：TE122[石油与天然气工程—油气勘探]