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针对汤原断陷生烃中心认识不清的问题,通过剥蚀量恢复、构造演化及沉积相分析等技术,开展了新生代沉积中心再认识工作。研究认为:汤原断陷新生代构造演化经历了两期伸展,两期挤压;断陷整体构造形态受控于东边界断层,为东断西超的箕状断陷特征;断陷中部沉积中心与沉降中心不一致,中央凸起带在新安村+乌云组—达连河组沉积时期为沉积中心,在宝泉岭组沉积末期隆升为凸起带;盆地原型控制着储层和烃源岩的分布,在中央凸起带上,达一段泥岩未进入生烃门限,生成大量生物气;新安村+乌云组深湖相泥岩分布局限,处于未熟—低熟阶段,导致生油量不足,未形成有效油藏。
Aiming at the problem of unclear understanding of the hydrocarbon generation center in Tangyuan fault depression, the re-recognition of Cenozoic sedimentary centers was carried out through the techniques of denudation recovery, tectonic evolution and sedimentary facies analysis. The study shows that the Cenozoic tectonic evolution of Tangyuan fault experienced two stages of extension and two periods of extrusion; the overall tectonic morphology of the fault depression is controlled by faults in the eastern border, which is the characteristic of the half-graben fault in the western segment of the East Fault; The center is not consistent with the subsidence center. The central bulge zone is the sedimentary center during the sedimentary period of Xinancun + Wuyun Formation - Dalianhe Formation and uplifted into a bulge zone at the end of the sedimentary period of Baoquanling Formation. The prototype of the basin controlled the reservoir and hydrocarbon source Rock distribution, in the central bulge zone up to a section of mudstone did not enter the hydrocarbon generation threshold, generating a large amount of biogas; Xinancun + Wuyun Formation deep lacustrine mudstone distribution is limited, in the immature - low maturity stage, resulting in insufficient oil production, No effective reservoir has been formed.