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针对文西断裂带的地质特点,以层序地层学、构造地质学、沉积学、石油地质学等理论为指导,以文西断裂带已发现的油气藏的解剖为基础,通过构造研究总结了研究区的断层封堵模式;通过层序地层分析,将沙二下亚段划分为三个中期沉积旋回,并进一步划分为8个短期沉积旋回,对沙三段也做了一些研究;根据沉积相分析,认为该区沙二下为洪水-漫湖亚相沉积,沙三上-沙三中为三角洲前缘亚相和前三角洲亚相沉积。在以上研究的基础上,分析不同类型油气藏成藏条件,建立了异地运聚、区内运聚、自生自储三种油气成藏模式。分析构造位置、断层封堵等油气分布主控因素,总结油气富集分布规律:含油层系多,平面上断块对油气分布影响很大;断裂带的构造位置造成了油气富集程度高;构造高部位有利于油气聚集;文西断层系弧形展布的内侧有利于油气富集。
Aiming at the geological characteristics of Wenxi fault zone, based on the theories of sequence stratigraphy, tectonics geology, sedimentology and petroleum geology, based on the anatomy of discovered reservoirs in Wenxi fault zone, Study the fault sealing pattern in the study area. According to the sequence stratigraphic analysis, the sub-grade Sha2 is divided into three mid-term sedimentary cycles and further divided into eight short-term sedimentary cycles. Some studies have also been done on the third member of Shahejie Formation. According to the phase analysis, it is considered that the second sand is the flood-Manhu subfacies deposition in the area, and the third sandstone upper-sand facies is the delta front facies sedimentation and the former delta subfacies. Based on the above studies, the different types of hydrocarbon accumulation conditions are analyzed, and three types of hydrocarbon accumulation modes are established, such as different transportation and accumulation, regional transportation and accumulation, and self-generation and accumulation. The major controlling factors of oil and gas distribution, such as tectonic position and fault sealing, are analyzed. The laws of oil and gas enrichment and distribution are summarized. There are many oil-bearing strata and the blocks on the plane have a great influence on oil and gas distribution. The structural location of the fault zone has caused a high degree of hydrocarbon enrichment. The high positions of the structures are favorable for the accumulation of oil and gas; the inner side of the arc-shaped distribution of Wenxi fault system is conducive to oil and gas accumulation.