渤海湾盆地保定凹陷东营组油气勘探重要发现与启示

doi:10.3969/j.issn.1672-7703.2023.02.002

摘要/Abstract

摘要： 渤海湾盆地保定凹陷早期以潜山和古近系深层为主力目的层进行勘探，历经近60年未获实质性发现。以一次三维地震采集和二维重新处理的地震资料为基础，整体认识地质结构，取得如下成果：一是古近纪早—中期（孔店组—沙河组二段沉积期），断陷活动西强东弱，湖盆浅且小；古近纪晚期（沙河组一段—东营组沉积期），断陷活动东强西弱，最大湖泛期为广湖盆沉积。二是沙一下亚段咸化湖富有机质藻源岩早期生烃、多期生烃，形成早熟油、低熟油。三是浅层东营组储盖组合好，是主力勘探层系。优选清苑构造带为突破口，构建“双向供烃、断砂输导、浅层富集”油气成藏模式，钻探G77X、BQ1X等预探井，在东营组获高产工业油流，保定凹陷获油气勘探突破，证实太行山前第一排凹陷浅层油气富集，对渤海湾盆地老油区勘探有借鉴意义。

关键词: 渤海湾盆地, 保定凹陷, 东营组, 富有机质藻源岩, 成藏模式, 勘探突破

Abstract: The early exploration in Baoding Sag in Bohai Bay Basin mainly targeted at the buried hill and deep Paleogene, but no substantial discovery was achieved in nearly 60 years. Based on 3D seismic acquisition and 2D seismic re-processing, the geological structure was reunderstood as a whole, and the following results were obtained: (1) In the Early-Middle Paleogene (during the deposition period of Kongdian Formation-Second member of Shahejie Formation), the fault rift activity was strong in the west and weak in the east, and the lake basin was shallow and small in sedimentary range; In the Late Paleogene (during the deposition period of the first member of Shahejie Formation-Dongying Formation), the fault rift activity was strong in the east and weak in the west, and it was a large lake basin in the maximum flooding period. (2) The organic-rich algal source rock in the saline lake basin in the lower part of the first member of Shahejie Formation experienced early and multi-stage hydrocarbon generation, forming early and low mature oil. (3) The reservoir-cap rock combination in shallow Dongying Formation is good, which is the main target layer. In addition, hydrocarbon accumulation pattern of “two-way hydrocarbon supply, hydrocarbon transport by sand and fault, and hydrocarbon enrichment in shallow formation” is constructed. As a result, several exploratory wells such as G77X and BQ1X were drilled in the optimally selected Qingyuan structural belt, and high-yield oil flows were tested in Dongying Formation,marking an exploration breakthrough in Baoding Sag, and confirming the oil and gas enrichment in shallow formation in the first row of sags in Taihang piedmont, which had reference significance for the exploration of mature oilfields in Bohai Bay Basin.

中图分类号:

TE122.1

张锐锋, 何海清, 朱庆忠, 范土芝, 李小冬, 周赏, 陈柯童, 史原鹏, 田建章, 李晓燕, 张宏伟, 秦梦华, 李艳友, 李奔, 赵堃. 渤海湾盆地保定凹陷东营组油气勘探重要发现与启示[J]. 中国石油勘探, 2023, 28(2): 11-23.

Zhang Ruifeng, He Haiqing, Zhu Qingzhong, Fan Tuzhi, Li Xiaodong, Zhou Shang, Chen Ketong, Shi Yuanpeng, Tian Jianzhang, Li Xiaoyan, Zhang Hongwei, Qin Menghua, Li Yanyou, Li Ben, Zhao Kun. Major discovery and enlightenment from petroleum exploration of Dongying Formation in Baoding Sag, Bohai Bay Basin[J]. China Petroleum Exploration, 2023, 28(2): 11-23.

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