大王庄鼻状构造古生界原油分布规律及控制因素分析

Oil Distribution and Controlling Factor of Paleozoic in Dawangzhuang Nosing Structure

摘要: 为了揭示大王庄鼻状构造古生界油气分布特征，综合利用录井显示、测井解释和试油资料中的油层信息，绘制了油气富集程度定量分布图。结果显示，研究区古生界原油显示普遍，奥陶系原油聚集位置明显受断层控制，南北向上主要沿东翼断层分布，原油多聚集在断层上升盘；东西向上主要聚集在东西向断垒之上；石炭–二叠系原油富集程度呈南北差异，油气主要富集在北部低部位，中部仅零星分布，南部高部位仅见油气显示，原油多在高级别断层附近聚集。通过典型油藏解剖和成藏条件对比，认为构造格局控制油气聚集带，反向断层遮挡控制油气聚集位置，盖层厚度影响油气富集程度。

Abstract: To reveal the oil distribution characteristics of Paleozoic in the Dawangzhuang nosing structure, oil-bearing grade given by well logs, logging interpretations and well test data was comprehen-sively used to map the oil and gas enrichment degree. The result shows that the Paleozoic oil shows in the study area is common, the accumulation position of Ordovician oil is obviously con-trolled by faults, oil mainly distributes along the eastern flank faults in the North-South direction; oil is mostly concentrated in the upthrow of faults; in the east-west direction is mainly concen-trated on the east-west fault horst. The enrichment degree of Carboniferous-Permian oil is different from north to south. The oil and gas is mainly concentrated in the low part of the north, and the central part is only scattered. Only the oil and gas shows in the high part of south, and the oil is mostly concentrated near the high-grade fault. Through the investigation of typical oil reserves and comparison of reservoir foemed conditions, it is considered that the tectonic framework controls the oil and gas accumulation zone, the hydrocarbon accumulation sealed by antithetic fault, and the thickness of the caprock affects the hydrocarbon enrichment degree.