塔中地区早二叠世岩浆活动特征及其石油地质意义  

Magmatic Activities and Their Influences on Hydrocarbon Accumulation in the Early Permian,Central Tarim Basin

作　　者：陈旭[1] 董玉文[1] 郝广雷[2] 

机构地区：[1]中国地质大学资源学院,武汉430074 [2]中国石油化工股份有限公司西北分公司,乌鲁木齐830011

出　　处：《地质科技情报》2010年第5期78-83,共6页Geological Science and Technology Information

基　　金：教育部重点科学技术研究项目(106113)

摘　　要：塔中地区早二叠世发生的大规模岩浆活动蕴含着丰富的石油地质信息。火山岩体(侵入岩和喷发岩)是流体穿层流动的一种特殊形式,对其活动特征及成因分析有助于洞察塔中地区流体活动信息和油气运聚特征。依据火山岩的地质与地球物理响应和钻井资料,开展了火山岩空间分布特征及其活动规律的研究,分析认为该区岩浆活动在早二叠世早期多沿断裂带以喷发为主,晚期以次火山侵入为主,由西北向东南逐渐减弱。岩浆活动一方面破坏或改造原始油气藏,另一方面促进油气生成、改善储集层空间。其中火山通道和伴生裂缝不仅是油气垂向输导的优势通道,还可以形成新的圈闭类型油气藏,如超覆-披覆型、岩体刺穿遮挡型、抬升淋滤型等。Igneous rock（intrusive rock and volcanic rock）formed by magmatic activities is a special style of cross-formational fluid flow.Hence,it is of great geological implication to study the large-scale magmatic activities in the central Tarim Basin in the Early Permian.The study of features and origin of the magmatic activity,in particular,will make it possible to understand the fluid flow and oil-gas migration characteristics better.This paper analyzes the spatial distribution and active regularity based on the response of geol-ogy-geophysics and drilling-logging data.The results show that magmatic activity is characterized by faul-ted eruption in early Early Permian and invasion in the later period,gradually weakening southeastward.On one hand,the magmatic activity destroyed or reformed the initial reservoirs,and on the other hand,it promoted the formation of hydrocarbon and improved the vacuity of the reservoir bed.Meanwhile,the vol-canic conduit and associated fractures formed good passageway for oil-gas migration.This can also form new types of oil-gas trap reservoir,including the overlapping and draping type,piercement type and uplifting leaching type.

关 键 词：塔中地区 岩浆活动 早二叠世 油气成藏 

分 类 号：P588.11[天文地球—岩石学] TE122.11[天文地球—地质学]