Sedimentary regularities,main controlling factors,and hydrocarbon exploration potential of the beach-bars of the Member 2 of Paleogene Shahejie Formation in Zhanhua sag,Bohai Bay Basin

Shao Changyin; Song Fan; Qiu Longwei; Zhang Shiqi; Kong Qingyuan

doi:10.7623/syxb202504004

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Sedimentary regularities,main controlling factors,and hydrocarbon exploration potential of the beach-bars of the Member 2 of Paleogene Shahejie Formation in Zhanhua sag,Bohai Bay Basin

更新时间：2025-12-13

- Sedimentary regularities,main controlling factors,and hydrocarbon exploration potential of the beach-bars of the Member 2 of Paleogene Shahejie Formation in Zhanhua sag,Bohai Bay Basin
- ACTA PETROLEI SINICA Vol. 46, Issue 4, Pages: 708-725(2025)
- 作者机构：
  
  深层油气全国重点实验室(中国石油大学(华东)),山东,青岛,266580
- 作者简介：
- 基金信息：
- DOI：10.7623/syxb202504004
  CLC： E121.3
- Published Online：10 May 2025，
  
  Published：2025
- 稿件说明：
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邵长印, 宋璠, 邱隆伟, 张世奇, 孔庆圆. 渤海湾盆地沾化凹陷古近系沙河街组二段滩坝沉积规律、主控因素及油气勘探潜力[J]. 石油学报, 2025, 46(4): 708-725.

Shao Changyin, Song Fan, Qiu Longwei, et al. Sedimentary regularities,main controlling factors,and hydrocarbon exploration potential of the beach-bars of the Member 2 of Paleogene Shahejie Formation in Zhanhua sag,Bohai Bay Basin[J]. ACTA PETROLEI SINICA, 2025, 46(4): 708-725.
邵长印, 宋璠, 邱隆伟, 张世奇, 孔庆圆. 渤海湾盆地沾化凹陷古近系沙河街组二段滩坝沉积规律、主控因素及油气勘探潜力[J]. 石油学报, 2025, 46(4): 708-725. DOI： 10.7623/syxb202504004.

Shao Changyin, Song Fan, Qiu Longwei, et al. Sedimentary regularities,main controlling factors,and hydrocarbon exploration potential of the beach-bars of the Member 2 of Paleogene Shahejie Formation in Zhanhua sag,Bohai Bay Basin[J]. ACTA PETROLEI SINICA, 2025, 46(4): 708-725. DOI： 10.7623/syxb202504004.

摘要

渤海湾盆地沾化凹陷沙河街组二段(沙二段)历经60余年的勘探

已形成“广覆含油、多点突破”的勘探局面。目前

由于沙二段发育于断陷向坳陷转化阶段(断—坳转换期)

在复杂盆地结构影响下

滩坝的沉积特征、主控因素和勘探潜力仍不够明确。基于钻井、测井和取心等地质资料

对沾化凹陷沙二段滩坝的沉积特征、沉积相展布规律、主控因素和勘探潜力开展了研究。研究结果表明:①沾化凹陷沙二段发育砂岩滩坝、碳酸盐岩滩坝和混积滩坝3种沉积相类型。纵向上

由沙二段4砂组至1砂组

砂岩滩坝、碳酸盐岩滩坝和混积滩坝的规模逐渐增大;横向上

砂岩滩坝分布于湖岸线附近

碳酸盐岩滩坝分布于渤南洼陷的鼻状构造带附近

混积滩坝分布于渤南洼陷的鼻状构造带及其两翼。②滩坝受风场、物源和盆地结构控制。由风场决定的湖盆水动力区控制了滩坝的类型、走向和分布位置

其中

砂岩滩坝发育于水动力最强的破浪带

碳酸盐岩滩坝和混积滩坝发育于水体能量较强的碎浪带;物源控制了滩坝的发育程度和类型

其中

物源充足区发育规模较大的砂岩滩坝

而物源匮乏区则发育碳酸盐岩滩坝和混积滩坝;断—坳转换期产生的独特盆地结构控制了滩坝的类型和分布位置

并在构造高部位发育砂岩滩坝、碳酸盐岩滩坝和混积滩坝。③沾化凹陷沙二段储层整体具有高孔、低渗的特征

砂体单层厚度为2~6 m的储层是勘探开发的有利目标

共识别出28个有利砂体

预测有利勘探面积为300.24 km

。研究成果以期为同类地质背景的油气勘探提供理论依据。

Abstract

After more than 60 years of exploration

the Member 2 of Shahejie Formation in Zhanhua sag of Bohai Bay Basin

has formed an exploration situation of "widely containing oil and making breakthroughs in many aspects". At present

due to the Member 2 of Shahejie Formation develo

ped in a transitional stage from rift to depression (rift-depression transition period)

under the influence of complex basin structure

the sedimentary characteristics

main controlling factors

and exploration potential of beach- bars are still unclear. Based on geological data of drilling

logging and coring

the paper investigates the depositional features

sedimentary facies distribution patterns

controlling factors

and exploration potential of beach-bars in the Member 2 of Shahejie Formation of Zhanhua sag. The research results show as follows. (1)Three types of sedimentary facies

i.e.

sandstone beach-bar

carbonate beach-bar

as well as mix beach-bar

have been identified in the Member 2 of Shahejie Formation. Vertically

the scale of all three beach-bar types gradually increases from the fourth sand group to the first sand group. Laterally

sandstone beach-bar facies are distributed near the lake shoreline

carbonate beach-bar facies are adjacet to the plunging structural belt in Bonan subsag

and the mix beach-bar facies are distributed across both the plunging structural belt and its flanks in Bonan subsag. (2)The development of beach-bar is mainly controlled by windfield

sediment source

and basin structure. Specifically

the windfield-controlled hydrodynamic zones of lake basin play a role in controlling the types

orientation and location of beach-bar. Sandstone beach-bar is developed in the breaker zone with the strongest hydrodynamic energy

while both carbonate and mix beach-bars are developed in the surfzone with strong water body energy. The sediment source influences the development scale and type of beach-bar. Large-scale sandstone beach-bar is developed in the area with sufficient provenance

while carbonate and mix beach-bars are developed in the area with poor provenance. The unique basin structure formed during the transition period has a controlling effect on the types and distributions of beach-bars. Sandstone

carbonate

and mix beach-bars are developed in structural high. (3)The M

ember 2 of Shahejie Formation reservoir exhibits high porosity and low permeability. The sand bodies with the layer thicknesses of 2 m to 6 m are favorable exploration targets in the study area. A total of 28 favorable sand bodies have been identified

and the favorable exploration area is predicted to be 300.24 km

. The research results are expected to provide a theoretical basis for oil and gas exploration under similar geological backgrounds.

关键词

Keywords

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