Sedimentary Characteristics of Nearshore Subaqueous Fans in the Heilongmiao Area of the Nanyang Sag

doi:10.11885/j.issn.1674-5086.2018.09.10.02

Abstract

Abstract: To determine the sedimentary characteristics and spatial evolution of nearshore subaqueous fans in the Heilongmiao Area, core observation, logging, laboratory analysis, and high-precision 3D seismic data analyses were performed. The lithology of the study area was mainly comprised of glutenite, gravel sandstone, pebbly sandstone, and fine sandstone, with major sediment pore types of intra-grain dissolved pores and intercrystalline pores. Gravity flow deposition structures were reflected by the blocky bedding, flushing surface, torn fragments of dark mudstone, liquefied structures, and sedimentary structures formed by traction flow, and we also found deposition structures of small-scale cross-bedding, horizontal bedding, and slab-like crossbedding. The sediments were divided into subphases of fan roots, fan body, and fan-end. Among them, the braided channel in the fan body exhibited the best physical properties and provided good reservoir conditions for oil and gas accumulation. The second section of the Hetaoyuan Formation in the Heilongmiao Area was divided into three subsegments. The development of the fans in each subsegment was controlled by the datum level change, and the overall sedimentary evolution model showed a superimposed fan development of progradation and regression.

Key words: Nanyang Sag, Heilongmiao Area, nearshore subaqueous fan, sedimentary characteristics, evolution rule

CLC Number:

TE122

WU Qun, YANG Yunfei, WANG Shufang. Sedimentary Characteristics of Nearshore Subaqueous Fans in the Heilongmiao Area of the Nanyang Sag[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 33-44.

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