松辽盆地南部大安地区姚一段特低渗砂岩成岩作用与成岩相  

Diagenesis and diagenetic facies of ultra-low permeability sandstone in the first member of Yaojia Formation in Da’an area, South Songliao Basin, China

作　　者：何庆斌[1,2] 张继红 HE Qingbin;ZHANG Jihong(School of Petroleum Engineering,Northeast Petroleum University,Daqing 163316,China;Honggang Oil Production Plant,Jilin Oilfield Company,Songyuan 138000,China)

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163316 [2]中国石油吉林油田分公司红岗采油厂,吉林松原138000

出　　处：《成都理工大学学报（自然科学版）》2022年第6期674-686,共13页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家科技重大专项(2016ZX05001-002);中国石油天然气股份有限公司重大科技专项(2016E-01)。

摘　　要：探讨松辽盆地南部大安地区上白垩统姚家组第一段(姚一段)特低渗砂岩中相对优质储层成因,为预测“甜点”储层分布和开发提供地质依据。综合物性、压汞、薄片、X射线衍射等多种数据,在姚一段成岩作用特征及对物性影响分析基础上,利用多种成岩强度参数进行特低渗砂岩成岩相划分,系统研究各成岩相特征及差异成因。结果表明:姚一段特低渗砂岩经历了压实成岩、胶结成岩、溶蚀成岩和胶结-交代成岩等4个阶段。姚一段岩石粒度细、黏土含量高、抗压实能力弱,强烈的压实作用是破坏物性的主要原因;多类型、多期次的胶结作用使孔隙结构复杂化,是导致特低渗的重要原因;长石、岩屑溶蚀有效改善了物性,是形成优质储层的关键。根据视压实率、视胶结率和视溶蚀率等成岩作用强度参数关系,将姚一段分为5种成岩相,各成岩相主要成岩作用类型和强度差异使孔隙沿不同路径演化,形成各自的孔隙组合,是导致其物性差异的根本原因。弱胶结中溶蚀相和弱压实中溶蚀相孔隙结构和物性最好,是有利储层类型;强压实弱胶结相和弱压实强胶结相孔喉细小、连通性差,为不利储层类型。The data of physical property, mercury injection, thin section and X-ray diffraction are analyzed in order to discuss the genesis of relatively high quality reservoirs in ultra-low permeability sandstone of the first member of the Upper Cretaceous Yaojia Formation(K3y~1) in Da’an area, southern Songliao Basin, and to provide geological basis for predicting the distribution and development of “sweet spot reservoir”. Based on the diagenetic characteristics and their influence on physical properties, the diagenetic facies of ultra-low permeability sandstone are divided by using a variety of diagenetic strength parameters, and the characteristics of diagenetic facies and the causes of differences are systematically studied. The results show that the K3y~1 formation rocks are characteristic of fine grain size, high clay content and weak compaction resistance and the ultra-low permeability sandstone has experienced four stages of diagenesis, namely the compaction diagenesis, cementation diagenesis, dissolution diagenesis and cementation-metasomatic diagenesis. In these diageneses, the strong compaction is the main reason for the damage of physical properties, while the cementation of multiple types and stages complicates the pore structure, which is an important reason for the ultra-low permeability. The dissolution of feldspar has effectively improved the physical properties and is the key to the formation of high quality reservoirs. According to the relationship of diagenetic intensity parameters, such as apparent compaction rate, apparent cementation rate and apparent dissolution rate, the K3y~1 can be divided into five diagenetic facies. The main diagenetic types and strength differences of each diagenetic facies lead to the evolution of pores along different paths and the formation of their respective pore assemblages, which is the fundamental cause of their physical differences. It is recognized that the dissolution phase in weak cementation have the best pore structure and physical properties, and produce

关 键 词：成岩相 特低渗砂岩 姚家组 大安地区 松辽盆地 

分 类 号：P588.212.3[天文地球—岩石学] TE122.221[天文地球—地质学]