准噶尔盆地西北缘哈山地区二叠系风城组沉积体系

doi:10.7657/XJPG20220403

摘要/Abstract

摘要：

准噶尔盆地西北缘哈山地区风城组发生强烈构造变形变位,针对该区风城组沉积体系的研究较少,制约了该区油气勘探。系统分析哈山地区三维地震、钻井、测井和岩心资料,对哈山地区不同区域风城组进行构造演化分析,恢复其原始地层位置,开展沉积相类型分析与对比研究,恢复该区风城组原始沉积体系。结果表明,哈山地区由西向东构造挤压强度逐渐减弱,西部、中部和东部下二叠统从早二叠世至现今的挤压缩短距离分别为33.0~40.0 km、25.0~30.0 km和15.0~20.0 km;风城组发育扇三角洲、滩坝和湖泊3种沉积相,发育一定规模的火山岩。风一段沉积时期,哈山地区北部发育大规模扇三角洲和滨浅湖,中—西部发育小范围分布的半深湖—深湖与滩坝,中—东部有火山岩发育;风二段沉积时期,半深湖—深湖沉积范围明显扩大,发育厚层白云质泥岩,扇三角洲砂砾岩和火山岩分布范围减小;风三段沉积时期,物源供给能力增强,北部和西部发育大规模连片分布的扇三角洲砂砾岩,局部发育半深湖—深湖和滩坝沉积。

关键词: 准噶尔盆地, 哈山地区, 二叠系, 风城组, 逆冲推覆带, 沉积相, 沉积体系, 构造演化, 地层恢复

Abstract:

The Fengcheng formation in the Hashan area in the northwestern margin of Junggar basin experienced strong tectonic deformation and structural displacement. There are few studies on the sedimentary system of the Fengcheng formation, which restricts the oil and gas exploration in this area. The 3D seismic, drilling, logging and core data in the Hashan area were systematically analyzed, and the structural evolution of the Fengcheng formation in different parts of the Hashan area was investigated, so that the original stratigraphic position of the Fengcheng formation was restored, the sedimentary facies types were analyzed and compared, and finally the original sedimentary system of the Fengcheng formation in this area was restored. The results show that in the Hashan area the tectonic compression strength gradually weakens from west to east, and the shortened distances of the Lower Permian from the Early Permian to the present in the western, central and eastern parts due to the compression are 33.0-40.0 km, 25.0-30.0 km and 15.0-20.0 km, respectively. Three types of sedimentary facies such as fan delta, beach bar and lake are developed and volcanic rocks of a certain scale are found in the Fengcheng formation. During the deposition of Feng 1 member, large-scale fan deltas and shore-shallow lakes were developed in the northern part of the Hashan area, semi-deep to deep lakes and beach bars in a small range in the central-western part, and volcanic rocks in the central-eastern part. During the deposition of Feng 2 member, the sedimentary range of semi-deep to deep lakes expanded significantly, thick layers of dolomitic mudstone was developed, and the distribution range of fan-delta sandy conglomerate and volcanic rocks decreased. During the deposition of Feng 3 member, the provenance supply capacity was enhanced, large-scale contiguous fan-delta sandy conglomerate was developed in the northern and western parts and semi-deep to deep lakes and beach bars were found locally.

Key words: Junggar basin, Hashan area, Permian, Fengcheng formation, thrust nappe zone, sedimentary facies, sedimentary system, tectonic evolution, stratigraphic restoration

中图分类号:

TE121

于洪洲, 王越, 周健, 薛雁. 准噶尔盆地西北缘哈山地区二叠系风城组沉积体系[J]. 新疆石油地质, 2022, 43(4): 396-403.

YU Hongzhou, WANG Yue, ZHOU Jian, XUE Yan. Sedimentary System of Permian Fengcheng Formation in Hashan Area in Northwestern Margin of Junggar Basin[J]. Xinjiang Petroleum Geology, 2022, 43(4): 396-403.

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