论文部分内容阅读
本文通过叠前深度偏移并结合探井资料、区域应力场的研究,指出埕北30潜山经历过印支期—燕山期北西向—燕山期北东东向局部应力场的转换及喜山期的区域拗陷,形成了古生界的反转结构,并导致潜山内幕逆断层及裂缝异常发育,古生界缺失严重;根据地层发育情况,分析了储、盖组合配置关系,指出该潜山存在多套储盖组合,由于裂缝极为发育,从而构成了良好的油气圈闭;根据构造幅度、地层岩性、断裂发育程度及盖层资料,指出本区中生界主要形成孔隙型风化壳油气藏,古生界主要形成以构造裂缝、溶蚀孔洞为主的块状油气藏;根据地化分析,认为埕北30潜山油气藏属于典型轻质凝析油气藏,桩东凹陷是其主要油气来源。
Based on the study of prestack depth migration and exploration data and regional stress field, it is pointed out that the Qiongbei 30 buried hills have undergone a transition from the Indosinian-Yanshanian NWW-Yanshanian to the NE-trending local stress field and the Himalayan period , Resulting in the reverse structure of the Paleozoic and leading to the abnormal development of reverse faults and fractures inside the buried hill and the serious lack of Paleozoic. According to the stratigraphic development, the relationship between reservoir and lid assemblages was analyzed. There are several sets of reservoir-cap assemblages in the mountains. Due to the extremely developed fractures, good oil and gas traps are formed. Based on the tectonic amplitudes, formation lithologies, degree of fault development and caprock data, it is pointed out that the Mesozoic mainly forms pore weathering crust According to the geochemical analysis, it is considered that the Qubei 30 buried hill reservoir belongs to the typical light condensate reservoir, and the East Piedmont Sag is the main oil and gas reservoir source.