Effect of Sand Body Enrichment Under the Restriction of a Tectonic Transfer Zone:A Case Study on the Pinghu Formation in the Kongqueting Region on the Pinghu Slope

• 作者: LI Junjie HOU Guowei QIN Lanzhi XIE Jingjing JIANG Xue
• 来源期刊: 中国海洋大学学报（自然科学英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: Energy and Mineral Sedimentology in the East China Sea
• 页码范围: 765-776
• 页数: 12页
• 语种: 英文

摘要

Results of long-term explorations in the Kongqueting region,located in an East China Sea depression,suggest that the strong fault activity during the sedimentary period of the Pinghu formation significantly influenced the development of the sedimen-tary system.However,the aggregation and enrichment of the sand body under a tectonic background has become a problem that re-quires an immediate solution.Considering research outcomes of previous studies,this study used three-dimensional seismic and log-ging data to identify Y-or H-type and the en echelon distribution patterns of the fault plane,as well as identify the locations wherein the fault growth index value is greater than 1 in the study region,indicating the tectonic background of the fault transfer zone in the region.Second,the development type of the fault transfer zone was studied,and the sand body enrichment site was identified based on seismic inversion data and the development position of the fault transfer point.This helps clarify the evolution of sedimentary facies of the Pinghu formation combined with the sedimentary environment of the braided-river delta.Finally,after summarizing the cou-pling relationship between the synsedimentary fault systems and the sand body enrichment patterns,three sand-control models were determined,namely,the flexural-parallel,the en echelon collinear,and the torsional-reformed superimposed transfer zones.The findings of this study lay a foundation for the subsequent search of tectonic lithologic oil and gas reservoirs.