济阳坳陷车西洼陷二叠系上石盒子组致密砂岩储层成岩-成藏系统演化  

Evolution of diagenesis-hydrocarbon accumulation system of tight sandstone reservoirs of Permian Upper Shihezi Formation in Chexi Subsag,Jiyang Sub-basin,China

作　　者：王艳忠[1,2] 宋磊 孟涛[3] 操应长[1,2] 孙沛沛 王淑萍[4] 弭连山 WANG Yanzhong;SONG Lei;MENG Tao;CAO Yingchang;SUN Peipei;WANG Shuping;MI Lianshan(School of Geosciences in China University of Petroleum(East China),Qingdao 266580,China;State Key Laboratory of Deep Oil&Gas,China University of Petroleum(East China),Qingdao 266580,China;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying 257000,China;Oil Industry Training Center,China University of Petroleum(East China),Qingdao 266580,China;Shengli Oil Production Plant,Shengli Oilfield Company,SINOPEC,Dongying 257000,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]深层油气全国重点实验室(中国石油大学(华东)),山东青岛266580 [3]中国石化胜利油田分公司勘探开发研究院,山东东营257000 [4]中国石油大学(华东)石油工业训练中心,山东青岛266580 [5]中国石化胜利油田分公司胜利采油厂,山东东营257000

出　　处：《中国石油大学学报（自然科学版）》2024年第4期43-56,共14页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(42272165)。

摘　　要：致密砂岩储层成岩-成藏系统演化决定储层致密化过程和优质储层成因与分布。以车西洼陷上石盒子组致密砂岩储层为例,通过薄片观察、包裹体分析、激光剥蚀电感耦合等离子质谱仪分析等技术,结合埋藏史和构造演化史,对致密砂岩储层的成岩-成藏系统演化进行系统研究。结果表明:车西洼陷上石盒子组致密砂岩储层硅质胶结物主要为来源于石英颗粒压溶作用的第一期石英次生加大边,长石溶蚀供源的第二期石英次生加大边、充填石英颗粒破裂缝型自生石英以及充填粒间孔隙型自生石英;高岭石分别为原始沉积的充填孔隙细晶高岭石杂基,大气淡水淋滤长石形成的充填孔隙粗晶高岭石,深埋藏封闭环境长石溶蚀原位沉淀形成的颗粒形态高岭石;车西洼陷上石盒子组致密砂岩的成岩-成藏系统演化过程为原始沉积的含细晶高岭石杂基的长石质石英砂岩→充填孔隙粗晶高岭石→黄色荧光油充注→硅质胶结物→天然气→充填孔隙粗晶高岭石→硅质胶结物→蓝色荧光油充注→天然气→颗粒形态高岭石、伊利石、绿泥石。The evolution of the diagenetic-accumulation system in tight sandstone reservoirs determines the densification process and the genesis and distribution of high-quality reservoirs.This study examines the tight sandstone reservoir of Permian Upper Shihezi Formation(P 2sh)in the Chexi Sag,integrating burial history,tectonic evolution history,and multi-proxy analyses such as thin sections,fluid inclusion analysis,and laser ablation inductively coupled plasma mass spectrometry to systematically study the evolution of the diagenesis-accumulation system.Results indicate that siliceous cement is derived from the pressure dissolution of quartz particles,which contributes the first phase of quartz overgrowth and from feldspar dissolution,which represents the second phase of quartz overgrowth and fills microfractures in quartz particles or intergranular pores.The kaolinite includes a fine-grained kaolinite matrix from the sedimentary period,coarse-grained kaolinite from the leaching of atmospheric freshwater through feldspars,and granular kaolinite from feldspar dissolution in a deep-burial closed system.The evolution process of the diagenesis-hydrocarbon accumulation system of the tight sandstone in the Upper Shihezi Formation,Chexi Subsag,follows this sequence:original sedimentary feldspar quartz sandstone with fine-grained kaolinite matrix→coarse-grained kaolinite→yellow fluorescence oil→siliceous cement→natural gas→coarse-grained kaolinite precipitation→siliceous cement→blue fluorescence oil→natural gas→authigenic kaolinite precipitation in granular form,illite and chlorite.

关 键 词：成岩-成藏系统演化 硅质胶结 高岭石 致密砂岩 上石盒子组 车西洼陷 

分 类 号：TE122[石油与天然气工程—油气勘探]