辽河油区火成岩油气藏勘探研究现状

Research Status of Igneous-rock Reservoir Exploration in Liaohe Oilfield

经过多年勘探实践,辽河油区在3大凹陷和外围中生界盆地发现了粗面岩、安山岩、辉绿岩等多种类型火成岩油气藏,初步形成了火成岩岩性识别、地震储层预测、岩相分析预测、储层测井评价等勘探配套技术系列。油藏主要发育于中生界和古近系沙三段,除粗面岩油藏外,油藏规模整体偏小,且具有以下特征:与烃源岩共生的火成岩成藏机率较高;火成岩物性受埋深影响小,受后期构造改造影响大;油气成藏受储集空间、岩性、发育层位、所处构造部位等综合因素控制。同时勘探还面临着地震资料攻关、岩体裂缝预测、火成岩成藏机理研究等系列技术难题。

Through many years of exploration in Liaohe Oilfield,various types of igneous reservoirs including trachyte,andesite and diabase reservoirs were discovered in three major depressions and peripheral Mesozoic Basins.Matching exploration techniques were developed,including igneous lithologic identification,seismic reservoir prediction,litho-facies analysis and prediction and reservoir logging evaluation.The reservoirs developed mainly Mesozoic and Paleogene Es3.The reservoir scales were generally small except for trachyte reservoir,and present following characteristics: igneous rocks associated with source rock were more likely to form hydrocarbon reservoirs;the physical property of igneous rock was less affected by burial depth,but it was seriously influenced by to later tectonic reconstruction;hydrocarbon accumulation was controlled by integral factors such as reservoir space,lithology,development horizon and structural location.In addition,a series of technical problems still exist in exploration,including the research of seismic data,rock fracture prediction and research on igneous reservoir forming mechanism.