裂谷盆地岩浆活动控制油气概论  

Outline on magmatic activities controlling oil-gas theory in rift basins

作　　者：万丛礼[1] 金强[2] 李钜源[3] 缪俊茜 

机构地区：[1]中国石化东北油气分公司勘探开发研究院,吉林长春130062 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [3]中国石化胜利油田分公司地质科学研究院,山东东营257015 [4]密苏里科技大学,密苏里州罗拉市65409

出　　处：《油气地质与采收率》2014年第1期1-5,111,共5页Petroleum Geology and Recovery Efficiency

摘　　要：裂谷盆地岩浆活动强烈,岩浆岩区油气资源丰富、物化性质异常、分布复杂。为了深入研究侵入岩区的油气分布规律,通过岩心观察和地球化学等方法,对沾化凹陷中东部地区侵入岩及其附近油气藏进行了分析。结果表明,岩浆的高温、高压及活跃的化学性质不仅显著促进了周围烃源岩的生排烃,而且使烃源岩内产生大量的裂缝和孔隙,成为良好的储层;岩浆岩的边缘相发育气孔、溶孔和收缩裂缝,为较好的储层;岩浆活动形成的异常高压场增强了地层对油气的吸附能力,且岩浆活动还可以形成多种类型的油气藏。岩浆活动不仅促进了油气生成,而且控制了油气的分布。岩浆活动对油气的控制作用主要取决于岩浆类型、活动强度、活动方式、活动时间、岩浆岩与烃源岩的空间关系以及烃源岩发育及其中有机质和碳酸盐岩含量等。There is great volume oil-gas which possesses abnormal chemical properties and complicated distribution regularity in riftbasins where ever existed strong magmatic activities. In order to study distribution regularity of the oil-gas, we analyzed the intrusionand its neighboring hydrocarbon reservoir in the middle-eastern Zhanhua sag by means of cores observation and geochemical analysis,and found that the magma high temperature, high pressure and active chemical properties not only promoted notably the hydrocarbongeneration in source rocks, but also caused a lot of cracks and organic pores. Border facies of the intrusion is good reservoir owing towell-developed gas pores, dissolution pores and contraction cracks. The overpressure field caused by the magmatic activities greatly im-proved the source rocks' adsorption capability on hydrocarbon. Furthermore, the magmatic activities can form many sorts of traps. Themagmatic activities can not only promote oil and gas generation, but also control the oil and gas distribution. In the end, we indicatethat the controlling of magma on hydrocarbon is dependent on magma activities time, strength, mode, and spatial relationship betweenmagmatite and source rocks and so on.

关 键 词：裂谷盆地 油气生成 油气聚集 岩浆活动 沾化凹陷 

分 类 号：TE112.26[石油与天然气工程—油气勘探]