苏北盆地溱潼凹陷古近系戴一段油气富集规律

doi:10.13809/j.cnki.cn32-1825/te.2023.06.016

摘要/Abstract

摘要：

苏北盆地溱潼凹陷戴一段埋藏浅、物性好，是发掘优质储量的主力勘探层系。研究应用层序地层学、沉积学、地球化学等基础理论、技术方法，综合地震、钻井岩心及测井等资料，开展溱潼凹陷戴一段层序地层格架下沉积微相和油气成藏条件综合分析，研究表明：扇三角洲前缘相带是岩性油藏发育有利区，纵向上最大湖泛面附近砂泥岩互层段为最优储盖组合，戴一段油气成藏受构造背景、沉积相带及区域走滑构造带共同控制，主要发育2大类、5小类油藏，经钻探证实，发现了规模整装构造—岩性油藏，勘探成效显著。

关键词: 苏北盆地, 溱潼凹陷, 古近系, 戴一段, 富集规律

Abstract:

The first member of the Dainan Formation in the Qintong Sag of the Subei Basin, characterized by its shallow burial and excellent physical properties, is identified as a key exploration target for high-quality hydrocarbon reserves. This study applies basic theories and technical methods such as sequence stratigraphy, sedimentology, and geochemistry, and integrates seismic, drilling core, and logging data to conduct a comprehensive analysis of sedimentary microfacies and oil and gas accumulation conditions under the sequence stratigraphic framework of the first member of Dainan Formation in Qintong Sag. The study shows that the fan delta front facies belt is a favorable area for the development of lithologic oil reservoirs, and the sand shale interbed near the largest lake flooding surface is the optimal reservoir cap combination vertically, The formation of oil and gas reservoirs in the first member of Dainan Formation is jointly controlled by the structural background, sedimentary facies belts, and regional strike slip structural belts. The study categorizes the oil reservoirs into two major categories and five subcategories. After drilling, it has been confirmed that large-scale integrated structural lithologic oil reservoirs have been discovered, and the exploration results are significant.

Key words: Subei Basin, Qintong Sag, Paleogene, first member of Dainan Formation, enrichment regularity

中图分类号:

TE37

邰浩,余文端,臧素华,史梦君,敬晓波,孙伟. 苏北盆地溱潼凹陷古近系戴一段油气富集规律[J]. 油气藏评价与开发, 2023, 13(6): 844-854.

TAI Hao,YU Wenduan,ZANG Suhua,SHI Mengjun,JING Xiaobo,SUN Wei. Hydrocarbon enrichment regularity of the first member of Paleogene Dainan Formation in Qintong Sag, Subei Basin[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(6): 844-854.

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