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勘探证实,南堡凹陷滩海地区下古生界碳酸盐岩潜山为含油气潜山,且已成为下一步勘探的重点领域。首先分析整个华北地区早古生代区域沉积背景,明确黄骅坳陷和冀中坳陷该时期处于统一的陆缘浅海沉积环境中;进而以冀中坳陷为参照,利用化石组合及岩电特征对南堡凹陷潜山钻井进行地层划分对比,建立南堡凹陷下古生界标准地层序列;在井—震标定基础上,解释上马家沟组、下马家沟组及寒武系出露范围;结合储层评价结果将奥陶系和寒武系分别划分出5套和6套储盖组合,分析认为下马家沟组储盖组合为下一步潜山勘探有利层系,为南堡凹陷下一步潜山油气勘探提供必要的地质依据和有利指导。
Exploration confirmed that the Lower Paleozoic carbonate buried hill in the Tanhai area of Nanpu Sag is a hydrocarbon-bearing buried hill and has become a key area for exploration in the next step. First of all, we analyzed the sedimentary background of the Early Paleozoic in the whole North China, and clarified that the Huanghua Depression and the Jizhong Depression were in a unified continental margin shallow sea sedimentary environment at that time. Based on the Jizhong Depression, Based on the well-seismic calibration, the interpretation stratigraphic sequence of the Upper Majiagou Formation, the Lower Majiagou Formation and the Cambrian outcrop area is discussed. Layers Evaluation Results The Ordovician and Cambrian strata were divided into 5 sets and 6 sets of reservoir-cap combinations respectively. It is concluded that the reservoir-cap assemblage in the Majiagou Formation is the favorable layer for the next exploration of buried hills and is the next step for buried hill oil and gas in Nanpu Sag Exploration provides the necessary geological basis and favorable guidance.