松南营城组火山岩储层天然裂缝特征及形成机理  

Characteristics and formation mechanism of natural fractures in volcanic reservoir of Yingcheng Formation in southern Songliao Basin

作　　者：赵向原[1] 王丹[1] 游瑜春[1] 郭艳东[1] 任宪军[2] 韩娇艳[2] 尚墨翰 Zhao Xiangyuan;Wang Dan;You Yuchun;Guo Yandong;Ren Xianjun;Han Jiaoyan;Shang Mohan(Petroleum Exploration&Production Research Institute,SINOPEC,Beijing 100083;Northeast Oil&Gas Branch,SINOPEC,Changchun 130062)

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石化东北油气分公司,长春130062

出　　处：《地质科学》2022年第3期720-732,共13页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：中国石化东北油气分公司项目“松南火山岩气藏储量动用及提高采收率研究”(编号:34500000-18-ZC0607-0014)资助。

摘　　要：研究火山岩储层天然裂缝发育特征及形成机理,对进一步开展裂缝空间分布预测及指导火山岩气藏开发具有重要意义。本文以松辽盆地南部营城组火山岩储层为例,综合利用岩心、薄片、测井、地震及分析测试等资料,对储层天然裂缝的发育特征及主控因素进行研究,并在裂缝分期配套的基础上,对裂缝形成机理进行分析。研究表明,松南营城组储层发育原生裂缝和次生裂缝两大类型,原生裂缝主要包括冷凝收缩缝和炸裂缝,次生裂缝为火山岩及其原生裂缝系统受后期构造运动、溶蚀、风化等作用改造而形成的各类裂缝。构造裂缝的走向有多组,且以高角度缝和直立缝为主,其发育特征和发育程度主要受断层和火山岩相控制。构造裂缝的形成具体包括5期,其中主要为3期,分别为晚侏罗世—早白垩世中期、晚白垩世明水期及古近纪和新近纪以来。结论认为,构造裂缝普遍规模大、发育程度高、有效性好,构成了营城组储层中最主要的渗流通道,对气藏渗流和开发特征影响最大。The research on the development characteristics and formation mechanism of natural fractures in volcanic reservoirs is of great significance for further predicting the spatial distribution of fractures and guiding the development of gas reservoirs. Therefore, taking the volcanic reservoir of Yingcheng Formation in southern Songliao Basin as an example, this paper studies the development characteristics and main controlling factors of natural fractures by comprehensively using core, thin section, well logging, seismic and analysis and testing data.Combined with the history of structural evolution, diagenetic evolution, buried reservoir history and oil and gas filling history, the fracture formation mechanism is divided on the basis of staged matching of fractures analysis. The study shows that there are two types of primary fracture and secondary fracture in Yingcheng Formation of Songnan. The primary fracture mainly includes condensation contraction fracture and explosion fracture. The secondary fracture is caused by volcanic rock and its primary fracture system. The fracture structure is formed by the transformation of late tectonic movement, dissolution and weathering. There are several groups of structural fractures, mainly high angle fractures and vertical fractures. The degree of development is mainly controlled by faults and volcanic facies.

关 键 词：天然裂缝 形成机理 火山岩储层 松辽盆地 营城组 

分 类 号：P618.13[天文地球—矿床学] TE121.1[天文地球—地质学]