吐哈盆地深层、超深层致密砂岩成岩作用及成岩相——以丘东洼陷J7井区三工河组二段为例  

Diagenesis and diagenetic facies of deep and ultra deep tight sandstone in Turpan-Hami Basin:a case study of the second Member of Sangonghe Formation in the J7 well area,Qiudong Subsag

作　　者：于海跃 肖冬生[1] 王波 YU Haiyue;XIAO Dongsheng;WANG Bo(Research Institute of Petroleum Exploration and Development,PetroChina Tuha Oilfield Company,Hami 839009,China;Hangzhou Research Institute of Geology,PetroChina,Hangzhou 310023,China)

机构地区：[1]中国石油吐哈油田公司勘探开发研究院,新疆哈密839009 [2]中国石油杭州地质研究院,浙江杭州310023

出　　处：《断块油气田》2024年第3期369-378,共10页Fault-Block Oil & Gas Field

基　　金：中国石油天然气股份有限公司科技项目“吐哈盆地深层-超深层致密砂岩气富集机理与关键评价技术研究”(2022DJ2107)

摘　　要：三工河组二段致密砂岩储层作为吐哈盆地重要的油气勘探目标,缺乏成岩作用及成岩相的定量评价。文中利用岩石薄片、物性分析、粒度分析、X射线衍射和扫描电镜等资料,并通过对视压实率、视胶结率、溶蚀增加孔隙度、破裂增加孔隙度以及成岩综合系数的计算,开展成岩相划分,同时运用灰色关联分析法,建立成岩综合系数的测井计算模型,实现对成岩作用及成岩相的定量评价。研究结果表明:吐哈盆地丘东洼陷J7井区三工河组二段岩性主要为岩屑砂岩和长石岩屑砂岩,结构成熟度与成分成熟度差,孔隙度多小于6%,渗透率多小于1×10^(-3)μm^(2),为典型的特低孔-特低渗储层,在地质历史时期主要经历了压实、溶蚀、胶结和破裂等成岩作用改造;三工河组二段致密砂岩储层共发育6种成岩相,其中强压实-溶蚀相和强压实-溶蚀微裂缝相为研究区重要的建设性成岩作用相带;研究区目的层不同砂层组的成岩相分布有一定差异,但总体规律基本一致,在一定条件下受到了沉积作用的影响。该研究不仅明确了研究区三工河组二段成岩相纵横向展布特征,同时为成岩作用的定量评价及预测提供了方法和技术支持。The tight sandstone reservoir of the second Member of Sangonghe Formation,which is the main target of oil and gas exploration in Turpan-Hami Basin,lacks quantitative evaluation of diagenesis and diagenetic facies.Diagenetic facies division was carried out based on the data of rock thin section,physical property analysis,grading analysis,X-ray diffraction and scanning electron microscopy,and on the basis of the calculation of related parameters such as apparent compaction rate,apparent cementation rate,porosity increased by dissolution,porosity increased by fracture and diagenetic comprehensive coefficient.At the same time,grey correlation analysis was used to establish the logging calculation model of diagenetic comprehensive coefficient,which realizes the quantitative evaluation of diagenesis and diagenetic facies.The results show that the lithology of the second Member of Sangonghe Formation in Qiudong subsag,Turpan-Hami Basin is mainly lithic sandstone and feldspar lithic sandstone,with poor structural maturities and compositional maturities,porosity less than 6.0%and permeability less than 1.0×10^(-3)μm^(2),which is a typical ultra-low porosity and ultra-low permeability reservoir.In geological history,the reservoir has undergone diagenetic transformation such as compaction,dissolution,cementation and fracturing.There are six kinds of diagenetic facies in tight sandstone reservoirs of the second Member of Sangonghe Formation,and the strong compaction-dissolution facies and the strong compaction-dissolution microfracture facies are important constructive diagenetic facies in the study area.There are some differences in the distribution of diagenetic facies among different sand groups of the target layer in the study area,but the general rule is basically the same,and it is affected by sedimentation under certain conditions.This study not only clarified the characteristics of the transverse and horizontal distribution of diagenetic facies in the second Member of Sangonghe Formation in the study area,but also

关 键 词：成岩作用 成岩相 致密砂岩 三工河组 丘东洼陷 吐哈盆地 

分 类 号：TE122.222[石油与天然气工程—油气勘探] P618.130.21[天文地球—矿床学]