Sedimentology of the deltaic Paleogene Shahejie Formation in the D-1 area of Liaodong Bay, East China
Sedimentology of the deltaic Paleogene Shahejie Formation in the D-1 area of Liaodong Bay, East China
复制标题
辽东湾D-1区三角洲古近系沙河街组沉积学
DOI：
10.1002/gj.3901
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发表时间：
2020
影响因子：
1.8
通讯作者：
Xu Changgui
中科院分区：
文献类型：
--
作者：
Zou Hao;Wang Jun;Chen Anqing;Zhong Yijiang;Chen Hongde;Liu Sibing;Liu Yang;Xu Changgui
位于中国东北部的辽东湾地区油气资源丰富。研究区(简称D-1)位于辽东湾构造单元辽东地块的东南部，勘探重点是古近系沙河街组砂岩单元。在这里，已在D-1-2SA井发现了石油产能为629立方米/天的碳氢化合物。结合岩屑、测井、地震、沉积相、层序地层学等资料对储集相进行了分析。在层序地层学研究中，将组二段划分为1个三级和4个四级沉积层序。沉积相包括扇三角洲体系、辫状河三角洲体系和泻湖体系。对每个体系域进行了层序格架、沉积模式和沉积分布的地震属性反演。D-1地区储集相具中低孔、中低渗特征。储集相带的发育与扇三角洲体系中储集性最好的水下沉积河道有关。这些通道具有很强的均方根幅度，用于识别储层目标的地震属性。具有花岗岩和变质源岩的源汇系统和相对较远的输导被认为是最具油气成藏潜力的地层。
The Liaodong Bay area in north‐east China has abundant hydrocarbon resources. The study area (referred to as D‐1) is located in the south‐east portion of the Liaodong Graben, a tectonic unit of Liaodong Bay, where the focus for exploration is on sandstone units in the Palaeogene Shahejie Formation. Here, hydrocarbons with an oil production capacity of 629 m3/day have been discovered in well D‐1‐2SA. The reservoir facies have been analysed by combining the cuttings, logging, seismic data, sedimentary facies, and sequence stratigraphy. In the sequence stratigraphic study, the second member from the base of the formation is divided into one third‐ and four fourth‐order depositional sequences. The sedimentary facies include fan deltaic, braided river deltaic, and lagoonal systems. Seismic attribute inversion of the sequence framework, depositional models, and sediment distribution has been conducted for each system tract. The reservoirs facies in the D‐1 area are characterized by medium to low porosity, and medium to low permeability. The development of reservoirs facies is related to the subaqueous depositional channels of the fan deltaic system with the best quality for hydrocarbon storage. These channels have strong root mean square amplitudes used for seismic attribute identification for reservoir targets. The formations of the source‐to‐sink system with granitic and metamorphic source rocks and relative distant transportation are considered to have the best potential for hydrocarbon reservoirs.