廊固凹陷大兴断裂带沙四——沙三段近岸水下扇沉积特征

发布时间：2018-02-26 04:04

本文关键词： 渤海湾盆地廊固凹陷大兴断裂带沙河街组近岸水下扇沉积微相　出处：《新疆石油地质》2017年02期 　论文类型：期刊论文

【摘要】：廊固凹陷大兴断裂带相继发现兴8、兴9等砾岩油气藏,油气资源丰富,且多数油气藏处于近岸水下扇扇中辫状水道微相,因此对大兴断裂带近岸水下扇的沉积特征进行研究显得尤为重要。综合前人研究成果和廊固凹陷最近获取的岩心、地震、测井等资料,对近岸水下扇进行了沉积微相特征的识别及沉积微相类型的划分,总结了近岸水下扇分布特征,并分别建立了碎屑流及泥石流近岸水下扇沉积模式。碎屑流近岸水下扇在旧州地区发育,扇体表现为厚层砾岩与泥岩的突变接触,沉积物主要是颗粒支撑砾岩,杂基含量很少;而泥石流近岸水下扇在固安地区发育,扇体几乎无水道发育,沉积物主要为杂基支撑砾岩,杂基主要为泥质。碎屑流近岸水下扇识别出扇根主水道、扇根水道间、扇中辫状水道、扇中辫状水道间、扇端席状砂和扇端泥6种沉积微相,其中扇中辫状水道微相是扇中甚至整个碎屑流近岸水下扇的主体,扇端亚相相对不发育。近岸水下扇整体上沿大兴断层呈近北东—南西向展布,在沙三下亚段最为发育。
[Abstract]:In the Daxing fault zone of Langgu depression, conglomerate reservoirs such as Xing 8 and Xing 9 have been discovered one after another, with abundant oil and gas resources, and most oil and gas reservoirs are located in the microfacies of braided channel in the subaqueous fan of the near shore. Therefore, it is very important to study the sedimentary characteristics of the subaqueous fan near the Daxing fault zone. Based on the previous research results and the core, seismic and logging data obtained recently from the Langgu depression, it is very important to study the sedimentary characteristics of the subaqueous fan near the Daxing fault zone. The characteristics of sedimentary microfacies and the types of sedimentary microfacies of near-shore underwater fan are identified, and the distribution characteristics of near-shore underwater fan are summarized. The detrital flow and debris flow near-shore underwater fan deposition model are established respectively. The clastic flow nearshore underwater fan develops in the Jiaozhou area. The fan body is characterized by sudden contact between thick layer conglomerate and mudstone. The sediment is mainly granular supporting conglomerate with little complex base content. While the underwater fan of debris flow near shore developed in Guan area, the fan body almost did not have waterway, the sediment was mainly supported conglomerate by complex foundation, and the sediment was mainly muddy. The main fan root channel and between the fan root channel were identified by the debris flow near shore underwater fan. The braided channel in the fan, between the braided channel in the fan, the sheet sand at the end of the fan and the mud at the end of the fan are six kinds of sedimentary microfacies, in which the microfacies of the braided channel in the fan is the main body of the underwater fan with the whole debris flow near the shore. The subfacies of the subfacies of the fan are relatively undeveloped. The near-shore underwater fan is distributed along the Daxing fault in the NNE-NW direction, and is the most developed in the lower part of Sha 3.
【作者单位】：中国石油大学地球科学学院油气资源与探测国家重点实验室;中国石油华北油田分公司;
【基金】：中国石油科技重大专项(2014E-3504)
【分类号】：P618.13

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