摘要
该凹陷的油藏类型及油气分布特征是:(1)有新生新储,新生古储和古生古储等三类四种成油组合类型。(2)按圈闭成因可把已发现的油气藏划分为三类十种。(3)有多套含油气层系,油气在纵向上可能分布于很大的深度,推测“湿气带”上限深度约为5000-5500 m。
Abstract
Langfang-Gu'an Depression, situated in Beijing-Tianjin region with an area of 2800 km, is a single faulted half-basin of the Eogene which developed on the Paleozoic-Proterozoic basement. It is suggested that: 1. According to oil source contrast and the analysis of the sedimentation and tectonics, the depression contains three categories and four kinds of source rock-reseryoir-cap assemblages. 2.The oil and gas pools can be divided into three categories and ten kinds based on their trapping origin. 3.Oil- and gas-bearing formations include the Minghuazhen Formation ofthe Neogene, the first, second, third and fourth members of the Eogene Sha-hejie Formation and the Ordovician as well. Vertically speaking, oil and gasmay probably distribute in a great depth, and the upper limit of wet-gas zoneis inferred to be in the depth of about 5000-5500m. The discovered pools mainly distribute in the Hexiwu and Liuquan structural belts which are located near oil-generating sags formed during the Late Shahejie stage, bot the exploration of stratigraphic and lithologic pools in Niubei slope zone and around Tongbeizhen sag should also be taken into account.
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