川西地区二叠系热碎屑流火山岩发育特征及其油气地质意义  

Development characteristics and petroleum geological significance of Permian pyroclastic flow volcanic rocks in Western Sichuan Basin,SW China

作　　者：彭浩[1,2] 尹成 何青林[3] 夏国勇[2] 刘勇 马廷虎[2] 陈康 刘冉[3] 苏旺[5] PENG Hao;YIN Cheng;HE Qinglin;XIA Guoyong;LIU Yong;MA Tinghu;CHEN Kang;LIU Ran;SU Wang(Southwest Petroleum University,Chengdu 610500,China;Development Department of PetroChina Southwest Oil and Gas Field Company,Chengdu 610051,China;Exploration and Development Research Institute of PetroChina Southwest Oil and Gas Field Company,Chengdu 610000,China;Gas Field Development Management Department of PetroChina Southwest Oil and Gas Field Company,Chengdu 610000,China;Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China)

机构地区：[1]西南石油大学,成都610500 [2]中国石油西南油气田公司开发事业部,成都610051 [3]中国石油西南油气田公司勘探开发研究院,成都610000 [4]中国石油西南油气田公司气田开发管理部,成都610000 [5]中国石油勘探开发研究院,北京100083

出　　处：《石油勘探与开发》2022年第1期56-67,共12页Petroleum Exploration and Development

基　　金：西南油气田分公司科技重大专项“四川盆地二叠系火成岩地球物理关键技术研究”(2019ZD01-03)。

摘　　要：通过野外露头、钻井岩心,以及地震资料分析,开展川西地区中上二叠统热碎屑流岩石学特征及储集层研究。认为川西地区中上二叠统“峨眉山火山岩”属于两个大的喷发旋回,发育的两套火成岩组合呈不整合接触。其下部旋回以溢流相火山岩为主,上部旋回发育热碎屑流火山角砾岩和火山碎屑熔岩,为典型的爆发相堆积,是一套微细溶蚀孔、超微溶蚀孔组成的优质孔隙型储集层。根据热碎屑流火成岩非均质性强、与围岩岩性和物性差异大的特征,利用地震属性分析方法,通过瞬时振幅与瞬时频率相干分析技术,对川西地区火山岩相及火山机构进行了刻画和预测,结果显示,简阳区块热碎屑流火山岩大面积发育,以YT1、TF2、TF8井附近为中心,发育3个火山机构群,分布面积约500 km^(2),是火山岩油气勘探最有利区。By examining field outcrops,drilling cores and seismic data,it is concluded that the Middle and Late Permian“Emeishan basalts”in Western Sichuan Basin were developed in two large eruption cycles,and the two sets of igneous rocks are in unconformable contact.The lower cycle is dominated by overflow volcanic rocks;while the upper cycle made up of pyroclastic flow volcanic breccia and pyroclastic lava is typical explosive facies accumulation.With high-quality micro-dissolution pores and ultra-fine dissolution pores,the upper cycle is a set of high-quality porous reservoir.Based on strong heterogeneity and great differences of pyroclastic flow subfacies from surrounding rocks in lithology and physical properties,the volcanic facies and volcanic edifices in Western Sichuan were effectively predicted and characterized by using seismic attribute analysis method and instantaneous amplitude and instantaneous frequency coherence analysis.The pyroclastic flow volcanic rocks are widely distributed in the Jianyang area.Centering around wells YT1,TF2 and TF8,the volcanic rocks in Jianyang area had 3 edifice groups and an area of about 500 km^(2),which is the most favorable area for oil and gas exploration in volcanic rocks.

关 键 词：四川盆地 二叠系 火山岩 峨眉山火山岩 热碎屑流 地震属性分析 分布预测 

分 类 号：TE122.2[石油与天然气工程—油气勘探]