惠民凹陷商741井区火成岩储集层研究
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摘要
惠民凹陷商 741井区有 3套火成岩 :第一套是分布于沙一段的火山碎屑岩和玄武岩 ,火山碎屑岩呈锥状分布 ,玄武岩呈层状分布 ;第二套以及第三套火成岩是侵入于沙三中亚段的辉绿岩 ,主要呈层状产出 ,形成期大致为沙三段沉积晚期。通过探井、三维地震资料等的综合分析和横向对比 ,确定了商 741井区各期火成岩的分布范围及其形态和产状 ,划分出火山通道充填相、爆发相、溢流相、侵入相等岩相类型 ,并划分了爆发相和侵入相的亚相。不同岩相带储集空间的发育特征不同 ,火山通道周围是有利储集层发育区。图 3表 2参 18
There are 3 sets of igneous rocks in the area of Well Shang 741 in the Huimin Sag. The first set consists of volcaniclastic rock and basalt, and is distributed in the first member of Shahejie Formation (Es 1 ). The volcaniclastic rock and basalt are distributed in coniform and stratiform occurrences, respectively. The second and third sets of igneous rocks are stratiform diabase, which developed at the later Es 3 , and invaded into the middle Es 3 member. By integrated analyses and comparisons of exploitation well with the three dimensional seismic data, the distribution area, shape and occurrence of the igneous rocks of various periods in Well Shang 741 area are determined. The igneous rocks of Well Shang 741 area can be classified into volcanic vent filled facies, outbreak facies, overfall facies, and invasion facies, etc. The outbreak and invasion facies are further divided into sub facies. The development features of reservoir space are different in different lithofacies belts. In a word, around volcanic vent is favorable reservoir development position.
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