Sequence architecture, depositional system evolution and controlling factors in a lacustrine basin: A case study from Changdi Area, Bohai Bay Basin, Eastern China

IF 1.6 3区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Geophysics and Engineering Pub Date : 2023-02-09 DOI:10.1093/jge/gxad007

Yuhan Cheng, Zhiwei Wang, Jingyan Liu, Q. Wu, Shina Yu, Xiao Ma, Dingliang Peng, Yiyao Zhang

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引用次数: 0

Abstract

The Paleogene Shahejie and Dongying formations of the eastern Bohai Bay Basin contain over 500m fluvial-deltaic deposits and over 600 m deltaic-lacustrine deposits, both of which are important for oil and gas exploration. This study aims to figure out the deposition system distribution within the sequence stratigraphy and predict the exploration target. Sequence boundaries are recognized by unconformities in the seismic profiles and abrupt changes in the well-logging curves (AC, SP, GR, Rt), and two 2nd order sequences and five 3rd order sequences (SQs1, SQs3 in Shahejie Formation and SQd1-SQd3 in Dongying Formation) are identified. Four types of depositional system and its distribution is determined by well-logging profiles, cores, relative sand content, and root-mean-square seismic attributes. The SQs3 sequence is dominantly by fan deltas and lacustrine deposits, the SQs1 sequence is dominantly by shallow lacustrine deposits, the SQd3 sequence is dominantly by braided-river delta, semi-deep lacustrine, and turbidite fan, the SQd2 sequence is dominantly by braided-river delta deposits, whereas the SQd1 sequence is dominantly by braided-river deposits. The controlling factors are determined by basin subsidence simulation and fossil data of biological palynology, indicating that tectonic activity is the main controlling factor in SQs3 and SQd3 while climate is the main controlling factor in the SQs1, SQd2 and SQd1 sequences. Combined with the physical properties of sandstone, it is concluded that the beach bar in the SQs1 sequence, turbidite fan in the SQs3 and SQd3 sequences, and thick sandstone in the SQd2 sequence are the important exploration targets.

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湖盆层序构型、沉积体系演化及控制因素——以渤海湾盆地昌地地区为例

渤海湾盆地东部古近系沙河街组和东营组含有500米以上的河流三角洲沉积和600米以上的三角洲湖泊沉积，对油气勘探具有重要意义。本研究旨在查明层序地层学中沉积体系的分布，并预测勘探目标。通过地震剖面中的不整合面和测井曲线（AC、SP、GR、Rt）的突变来识别层序边界，并识别出两个二阶层序和五个三阶层序（沙街组的SQs1、SQs3和东营组的SQd1-SQd3）。测井剖面、岩心、相对含砂量和均方根地震属性决定了四种类型的沉积体系及其分布。SQs3序列以扇三角洲和湖相沉积为主，SQs1序列以浅湖相沉积为辅，SQd3序列以辫状河三角洲、半深湖相和浊积扇为主，SQd2序列以辫形河三角洲沉积为主，而SQd1序列以辫河沉积为主。通过盆地沉降模拟和生物孢粉化石数据确定了控制因素，表明构造活动是SQs3和SQd3序列的主要控制因素，而气候是SQs1、SQd2和SQd1序列的主要影响因素。结合砂岩的物性，认为SQs1序列中的滩坝、SQs3和SQd3序列中的浊积扇、SQd2序列中的厚砂岩是重要的勘探目标。

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来源期刊

Journal of Geophysics and Engineering 工程技术-地球化学与地球物理

CiteScore

2.50

自引率

21.40%

发文量

审稿时长

4 months

期刊介绍： Journal of Geophysics and Engineering aims to promote research and developments in geophysics and related areas of engineering. It has a predominantly applied science and engineering focus, but solicits and accepts high-quality contributions in all earth-physics disciplines, including geodynamics, natural and controlled-source seismology, oil, gas and mineral exploration, petrophysics and reservoir geophysics. The journal covers those aspects of engineering that are closely related to geophysics, or on the targets and problems that geophysics addresses. Typically, this is engineering focused on the subsurface, particularly petroleum engineering, rock mechanics, geophysical software engineering, drilling technology, remote sensing, instrumentation and sensor design.