苏北盆地海安凹陷南部岩性油藏勘探成果及启示

doi:10.3969/j.issn.1672-7703.2018.03.007

摘要/Abstract

摘要： 苏北盆地海安凹陷是晚白垩世发育起来的箕状断陷，早期勘探主要围绕古近系泰州组展开，阜宁组长期以来被认为是"皮厚肉薄"，资源有限。通过解放思想，转变勘探思路，海安凹陷南部阜宁组相继发现了张家垛、曲塘、向阳-胡集3个含油气区带，"十二五"期间累计提交探明储量达1353×10⁴t。通过海安凹陷南部岩性油藏的勘探实践，取得以下几点认识：①海安凹陷南部存在晚期生烃、晚期成藏的"封存箱"生、储体系，具有高效排烃、高效富集的特征，重新计算海安凹陷曲塘次凹资源量达9000×10⁴t；②建立了海安凹陷南部滩坝砂沉积模式，曲塘次凹滩坝砂发育，坝砂呈现东西向条带状展布，集中分布于北部张家垛曲塘地区，南部以滩砂为主；③海安凹陷南部生烃期、排烃期与阜三段圈闭形成期时空匹配关系较好，有利于形成阜三段滩坝砂岩性油气藏；④平面上油藏围绕生烃洼陷展布，受沉积微相控制；纵向上主要生储盖组合决定岩性油气藏的分布层位。长期活动断层为输导断层，控制油气富集。

关键词: 苏北盆地, 海安凹陷, 岩性油藏, 勘探成果, 异常高压, 滩坝砂

Abstract: Haian depression in the Subei Basin is a half graben-like faulted depression which is developed in the Late Cretaceous, and its early exploration mainly focuses on Paleogene Taizhou Formation. It has been deemed for a long period that Funing Formation is thick in the cover and thin inside with limited resources. As the exploration idea is innovatively transformed, three hydrocarbon bearing zones including Zhangjiaduo, Qutang and Xiangyang-Huji are discovered successively in Funing Formation in the south of Haian depression, and their submitted cumulative proved reserves during the 12th Five-Year Plan are 1353×10⁴t. The following cognitions are obtained based on the practical exploration of lithological oil reservoirs in the south of Haian depression. First, there is a "compartment" source-reservoir system with hydrocarbon generation and accumulation in the late stage in the south of Haian depression and it is characterized by effcient hydrocarbon expulsion and accumulation. The amount of resources in Qutang sub-depression of Haian depression is recalculated and it is up to 9000×10⁴t. Second, the sedimentary model of beach-bar sand in the south of Haian depression is established. The beach-bar sand is developed in Qutang sub-depression. Bar sand is distributed in the shape of EW band and it is mainly concentrated in the area of Zhangjiaduo-Qutang in the north while beach sand is mainly distributed in the south. Third, the hydrocarbon generation and expulsion periods in the south of Haian depression are well matched with the formation period of Ef₃ (Fu 3 Member) trap in time and space, and it is favorable for the formation of lithological oil reservoir of Ef3 beach bar sand. And fourth, the oil reservoirs are areally distributed around the hydrocarbon generating sags and they are controlled by sedimentary microfacies. The vertical distribution of lithological oil reservoirs are dominated by the main source-reservoircaprock assemblages. The long-term active faults are conducting faults which control the accumulation of hydrocarbon.

Key words: Subei Basin, Haian depression, lithological oil reservoir, exploration achievement, abnormal pressure, beach-bar sand

中图分类号:

骆卫峰, 余文端, 马晓东, 周韬, 刘欣. 苏北盆地海安凹陷南部岩性油藏勘探成果及启示[J]. 中国石油勘探, 2018, 23(3): 56-63.

Luo Weifeng, Yu Wenduan, Ma Xiaodong, Zhou Tao, Liu Xin. Exploration achievement of lithological oil reservoirs in the south of Haian depression, the Subei Basin and its enlightenment[J]. China Petroleum Exploration, 2018, 23(3): 56-63.

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