松辽盆地台九区块葡萄花油层油气成藏模式与主控因素

为了解台九区块葡萄花油层油气成藏规律,采用油气分布与成藏条件叠合分析方法,研究其油气成藏的主控因素和模式。结果表明:油源断裂附近高砂地比区是油气成藏的有利范围;局部正向构造是油气聚集的有利部位;砂岩厚度控制油气纵向聚集层位。油气成藏模式为:下部青一段源岩生成的油气沿油源断裂向上输导运移,在姚二三段盖层的遮挡下,向葡萄花油层两侧砂体大于20%的地层发生侧向分流运移,最终在油源断裂附近的正向构造内的断层遮挡、断鼻、断层-岩性和砂岩透镜体圈闭中聚集成藏。

Main controlling factors and mode of oil and gas accumulation and distribution of P oil layer of Tai9 in Songliao Basin

This paper is motivated by a research into the law underlying oil and gas accumulation m P oil layer in Tai9 of Songliao Basin. The study looks at the main controlling factors and mode associated with oil and gas accumulation using an analysis method--a combination of hydrocarbon distribution and reservoir-forming condition. The results show that the range with high ratio of sand-stratum near faults connected with source rocks is an area favorable for oil and gas accumulation; partial positive construction is position favorable for oil and gas to accumulation ; the layers of oil and gas accumulation in the vertical are controlled by the thickness of sandstone. Oil and gas accumulation is found to be in such a mode that hydrocarbon coming from underlying K2qnl layer＇ s source rocks begins with migrating upward along faults connected with source rocks, continues to transport laterally into strata of P oil layer with ratio of sand- stratum greater than 20%, due to the blocking of cap rock in K2n layer, and ends up with accumulation into fault sealing traps, nose-shaped high traps and fault-lithology traps of positive construction which are near faults connected with source rocks.