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2004年,渤海湾盆地黄骅坳陷南堡凹陷老堡南1井奥陶系潜山测试获日产700m3高产油流,南堡油田被发现。综合岩心、钻井、地震及测井等多种资料,分析探区油气地质特征,对影响油气聚集成藏的主控因素进行总结。研究表明:①南堡凹陷奥陶系潜山有利储层的发育是受多旋回构造运动与多期岩溶作用控制的断裂裂缝—岩溶复合储集体,储集空间主要是断裂裂缝、溶蚀孔洞及溶洞充填沉积的溶积砂岩、砂砾岩原生孔隙;②沙三段发育优质烃源岩,是油气的主要来源;③油气藏分布受优势储层控制,由断裂和不整合组成的纵横交错的网状输导体系为油气纵向和横向运移创造条件,有效烃源岩与潜山有利圈闭空间良好配置是油气能否运聚成藏的关键,潜山高部位是油气聚集的有利区带,潜山低部位只要储层发育也可聚集油气;④储层是控制油气成藏的最为重要的要素,南堡凹陷奥陶系潜山油气勘探主攻方向是多旋回构造—岩溶作用形成的断裂裂缝—岩溶复合储集体。
In 2004, the Ordovician buried hill in Laobo-Nan-1 well in the Nanpu Sag of the Huanghua Depression in the Bohai Bay Basin was tested for high-yielding 700m3 of oil and Nanpu Oilfield was discovered. Based on a variety of data such as core, drilling, seismic and well logging, the geological characteristics of oil and gas in the exploration area are analyzed and the main controlling factors affecting the accumulation of oil and gas are summarized. The results show that: ①The development of the favorable reservoirs of the Ordovician buried hill in Nanpu Sag is a fractured fracture-karstified composite reservoir controlled by multi-cycle tectonic movement and multi-stage karstification. The reservoir space is mainly fractures, dissolved pores and karst caves Filling the sedimentary sedimentary sandstone and glutenite primary pore; (2) developing the high-quality source rock in the third member of the Shahejie formation, which is the main source of oil and gas; (3) the distribution of oil and gas reservoirs is dominated by the dominant reservoirs and is composed of fractures and unconformities The transport system creates the conditions for longitudinal and lateral migration of oil and gas. The effective configuration of effective source rock and buried hill is the key to whether oil and gas can migrate and accumulate. High sites of buried hill are the favorable zones for oil and gas accumulation, The lower part of the reservoir can also accumulate oil and gas as long as the reservoir is developed. (4) Reservoirs are the most important factor controlling the hydrocarbon accumulation. The main direction of Ordovician buried hill oil and gas exploration in Nanpu Sag is fracture fracture-karst formed by multi-cycle tectono-karstification Compound reservoir.