乌伦古地区石炭系火山岩成岩作用及其对储层发育的影响  

Diagenesis of Carboniferous volcanic rocks in Wulungu area and its implications for the volcanic reservoir development

作　　者：谷文龙 牛花朋[1,2] 张关龙 王圣柱 于洪洲 焦小芹 熊峥嵘 周健 GU Wenlong;NIU Huapeng;ZHANG Guanlong;WANG Shengzhu;YU Hongzhou;JIAO Xiaoqin;XIONG Zhengrong;ZHOU Jian(State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Research Institute of Petroleum Exploration and Development,Sinopec Shengli Oilfield Company,Dongying 257015,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石油化工股份有限公司胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《地学前缘》2023年第2期296-305,共10页Earth Science Frontiers

基　　金：国家科技重大专项(2017ZX05063002-006);北京高等学校青年英才计划项目(YETP0669)。

摘　　要：准噶尔盆地石炭系具有广阔的油气勘探前景,但勘探效果一直不理想。本文通过岩心观察、薄片鉴定、阴极发光以及扫描电镜、微米CT等多种分析结果,重点对准东北缘乌伦古地区火山岩储层的成岩作用及其对储层发育的影响进行了研究。研究结果表明:研究区火山岩先后经历了冷凝固结、岩浆期后热液作用、风化剥蚀淋滤作用和埋藏成岩作用4个成岩阶段,主要发育冷凝固结作用、压实作用、溶蚀作用、充填胶结作用、蚀变作用和交代作用6种成岩作用。冷凝固结作用和溶蚀作用可以形成原生孔隙、溶蚀孔和溶蚀裂缝,对改善储层质量起关键性作用;压实作用、充填胶结作用、蚀变作用及交代作用大大减少了原有储集空间。CT扫描成像、测井解释等定量化分析结果表明上石炭统储层储集性能略优于下石炭统,研究区有利储层发育区主要位于上石炭统储层。The Carboniferous of the Junggar Basin has broad prospects for oil and gas exploration, but the exploration result has not been ideal. Through core observation, thin section identification as well as cathodoluminescence spectroscopy, scanning electron microscope and micron CT investigations, this paper focuses on the diagenesis of volcanic reservoir in the Wulungu area, Junggar Basin and its implications for the volcanic reservoir development. Our study shows that the diagenetic process in the study area can be divided into four stages—condensation consolidation, post magmatic hydrothermal, weathering denudation-leaching and burial stages, involving six main processes—condensation consolidation, compaction, dissolution, filling cementation, alteration and metasomatism. Condensation consolidation and dissolution can form primary and dissolution pores and dissolution fractures, playing a key role in improving reservoir quality. Compaction, filling cementation, alteration and metasomatism, on the other hand, greatly reduce primary reservoir space. Quantitative micron CT analysis and logging interpretation results show that the reservoir quality of the Upper Carboniferous is slightly better than that of the Lower Carboniferous, but they all show strong heterogeneity.

关 键 词：准噶尔盆地 乌伦古地区 火山岩储层 成岩作用 成岩阶段 

分 类 号：P618.130.2[天文地球—矿床学] P588.14[天文地球—地质学]