苏北盆地溱潼凹陷岩性油藏勘探成果及启示

摘要/Abstract

摘要： 苏北盆地溱潼凹陷是典型的小型断陷盆地,该凹陷经过多年的勘探，丰度较高且未被发现的构造油气藏越来越少，而规模较大、丰度相对较低的岩性油气藏勘探潜力较大。“十二五”期间，通过解放思想，转变勘探思路，夯实基础研究，应用层序地层学和地震沉积学等新技术、新方法，溱潼凹陷发现储量大幅增长，其中岩性油藏占比较高，先后发现西部斜坡带帅垛—陈家舍地区戴一段超覆尖灭型岩性油藏，俞垛—华庄、帅垛地区阜三段两个千万吨级构造—岩性油藏，并在与火山岩相关的岩性油藏勘探中发现了良好苗头。研究认为，戴一段岩性油藏相控圈闭是基础，断层—砂体输导体系是关键，保存条件是核心；阜三段构造—岩性油藏具有近源富集、相带控藏、断裂输导的“三元”控制成藏规律，对下一步勘探工作起到了较好的指导作用。“十二五”期间溱潼凹陷岩性油藏丰富的勘探成果表明，该区戴一段、阜三段以及与火山岩相关岩性油藏仍是今后苏北盆地溱潼凹陷岩性油藏勘探的重点。

关键词: 溱潼凹陷, 岩性油藏, 成藏规律, 勘探启示, 勘探潜力

Abstract: The Qintong sag in the North Jiangsu Basin is a typical minor faulted basin. Over years of exploration, undiscovered structural oil and gas reservoirs with high abundance have become less and less, but large lithologic reservoirs with low abundance are prospective for exploration. During the 12th Five-Year Plan, some new technologies and methods of sequence stratigraphy and seismic sedimentology were deployed to promote reserve discoveries in the Qintong sag. Among these discoveries, lithologic reservoirs took a relatively high proportion. For example, the overlapping and pinchout lithologic reservoir in the Ed-1 Member of the Shuaiduo-Chenjiashe area on the Western Slope Belt and two structural-lithologic reservoirs with reserves of ten million tons in the Yuduo-Huazhuang are and the Ef-3 Member of the Shuaiduo area were discovered successively. In addition, favorable signs were observed during exploration of lithologic reservoirs related to volcanic formations. Research results show that phase-controlling traps can be seen as the foundation, fault-sand body conductivity system as the key and preservation conditions as the core for the formation of lithologic reservoir in the Ed-1 Member . Moreover, the structural-lithologic reservoir in the Ef-3 Member are characterized by three controlling factors, i.e. near-source accumulation, control of phase belt, and conductivity of faulting systems. The research results may provide necessary guidance for future exploration operations. Exploration findings related to lithologic reservoirs in the Qindong sag made during the 12th Five-year Plan reveal that lithologic reservoirs in the Ed-1 and Ef-3 Members, together with those related to volcanic rocks, will remain as key exploration targets for lithologic reservoirs in the Qintong sag, North Jiangsu Basin.

Key words: Qintong sag, lithologic reservoir, hydrocarbon accumulation pattern, exploration revelation, exploration potential

吴群, 余文端, 骆卫峰, 臧素华, 昝灵, 吴伟. 苏北盆地溱潼凹陷岩性油藏勘探成果及启示[J]. 中国石油勘探, 2016, 21(3): 99-107.

Wu Qun, Yu Wenduan, Luo Weifeng, Zang Suhua, Zan ling, Wu Wei. Achievements and recognitions of exploration in lithologic reservoirs in Qintong sag, North Jiangsu Basin[J]. China Petroleum Exploration, 2016, 21(3): 99-107.

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