<松辽盆地西部突泉地区上古生界油气有利勘探方向>
首发时间:2021-02-26
摘要:关松辽盆地西部突泉地区上古生界分布广泛、连续、厚度巨大,烃源岩发育。由于绝大多数烃源岩未进入二次生烃门限(或二次生烃强度太低),以致于严重制约了油气成藏。应用野外调查和地球物理等方法,发现研究区在中生代发生过强烈的岩浆侵入活动;通过野外调查和岩心观察,进一步发现侵入岩周围上古生界烃源岩热变质显著以及发育大量裂缝,而且裂缝中见油气显示。研究认为,岩浆异常高温不仅显著促进了烃源岩二次生烃,而且岩浆异常高压产生大量储集空间。最后指出,突泉地区上古生界侵入岩周围油气成藏条件良好,是有利的勘探方向。
关键词: 突泉地区 上古生界 岩浆侵入 二次生烃作用 储集性改造作用
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Abstract:The Upper Paleozoic in Tuquan area of Western Songliao Basin is widely distributed, continuous and thick, and the source rocks are well developed. Because most source rocks do not reach the threshold of Secondary Hydrocarbon Generation (or the intensity of secondary hydrocarbon generation is too low) , the hydrocarbon accumulation is seriously restricted. By using the geophysics method, it is found that there was a strong magmatic intrusion in the Mesozoic era in the study area, Through field geological investigation and core observation, we further found that the thermal metamorphism of the upper Paleozoic source rocks around the intrusive rocks is remarkable and a lot of fractures are developed, and oil and gas show up in the cracks. The study shows that the high temperature of magma promotes the secondary hydrocarbon generation of source rocks, and the high pressure of magma leads to a large amount of reservoir space. Finally, we pointed out that the favorable conditions for oil and gas accumulation in intrusive rock area are favorable for exploration of upper Paleozoic in Tuquan area.?
Keywords: Tuquan area, upper Paleozoic, magma intrusion, secondary hydrocarbon generation, reservoir reworking
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