欧利坨子地区火山岩储层特征及成因探讨

Characteristics and origin of igneous reservoir in Oulituozi area

综合应用岩心观察及化验分析资料 ,对欧利坨子地区火山岩储层进行了细致研究。搞清了本区火山岩的岩石类型、储集空间类型及其成因 ,预测了有利储层发育带 ,为下一步火山岩的油气勘探提供了依据。该区火山岩岩石类型有熔岩 (以粗面岩为主 )、火山碎屑岩两大类 ,其成因主要是大陆环境 ,以岩浆分异结晶占主导地位 ,部分熔融占次要地位 ;火山岩最有利的储集空间组合为砾间孔 +溶孔 +裂缝。从岩性上看 ,各种角砾岩、角砾化岩石是比较有利的储层 ;从分布上看 ,火山岩风化壳和断裂破碎带是有利的储层发育带。欧利坨子地区火山岩地层极为发育 ,具有良好的油气勘探前景 。

Core observation and experimental analysis data are utilized comprehensively to perform fine study upon igneous reservoir in Oulituozi area. Favorable reservoir developed zones are predicted for further hydrocarbon exploration after rock type, reservoir space and its origin of igneous rock have been understood deeply. Lava (mainly trachyte) and igneous clastic rock are the two main types which are of continental environment with magma iso crystalization taking the domination role and melting as the secondary. Most favorable reservoir space combination is inter gravel pores, deep pores and fractures. Furthermore, various breccia and brecciation rocks are favorable reservoirs in terms of lithology, while igneous weathered crust and faulted/fragmented zone are favorable reservoir developed areas in terms of distribution. Final results present that igneous reservoir in Oulituozi area is greatly developed with good prospect, so igneous fragmented zone or fractures developed zone should be taken as main exploration target in the future.