川西坳陷西部龙门山隆升时期上三叠统须家河组沉积响应

doi:10.11743/ogg20210403

Abstract

Abstract:

The Upper Triassic Xujiahe Formation in Western Sichuan Depression, Sichuan Basin, was deposited against a marine to terrestrial backdrop.With nearby Longmenshan uplifting during the period, the formation received various provenance inputs that led to a complex sandstone distribution and high reservoir heterogeneity.To reveal the distribution of sand bodies as well as the depositional history and response of the formation to the uplifting, we took the second to fourth members as study objects and analyzed their drilling, logging and seismic data.The results suggest that the uplifting of northern Longmenshan with weak extrusion and intense sediment flux led to a major supply of sands from Micangshan-Dabashan during the deposition of the second member.The stacked channels at the transitional delta front show a relative consistency and inheritance, with the main drainage line migrating eastward.The underwater uplifting of northern and middle parts of the mountain with intensive extrusion and weak sediment flux resulted in a supply of sediments from ancient Kangdian land and Micangshan-Dabashan during the deposition of the third member, with deltaic sand bodies mainly distributing in the north and south of the basin and sand bars in the center of the basin.During the deposition of the fourth member, the northern, central and southern parts of the mountain had all been uplifted.And with a weak extrusion and intensive sediment flux, the uplifting introduced a supply of sediments from both Micangshan-Dabashan and Longmenshan, resulting in a wide distribution of lacustrine delta sandstones of NW-SE and NE-SW orientations.It concludes that the uplifting intensity disparity and rising sequence of the different parts of Longmenshan during the episodic extrusion process are probably the joint controlling factors on the depositional processes and accumulation of sediments in the Western Sichuan Depression.

Key words: heterogeneity, sand body distribution, depositional filling, Longmenshan, Xujiahe Formation, Western Sichuan Depression, Sichuan Basin

CLC Number:

TE121.3

Hongde Chen, Lei Liu, Liangbiao Lin, Xinglong Wang, Zhiwei Wang, Yu Yu, Jian Zeng, Pengwei Li. Depositional responses of Xujiahe Formation to the uplifting ofLongmenshan during the Late Triassic, Western Sichuan Depression[J]. Oil & Gas Geology, 2021, 42(4): 801-815.

Figures/Tables 11

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体系	沉积体系	类型	主要亚相	岩性及测井识别标志	主要分布层位
陆相沉积体系	冲积扇	早地扇、湿地扇	扇根、扇中	颗粒支撑，砾、砂、泥混合；顶、底突变接触，多呈箱形高阻	须四段
	湖泊三角洲	扇三角洲	三角洲平原、三角洲前缘、前三角洲	富砾，高砂地比，钙屑砂岩为主；箱形曲线组合为主	须四段
	湖泊三角洲	辫状河三角洲	三角洲平原、三角洲前缘、前三角洲	中砂地比，岩屑砂岩为主；箱形和钟形组合	须四段
	湖泊	硅质碎屑湖泊	浅湖	粉砂岩-细砂岩、泥岩为主，低砂地比；低幅柱形夹指形	须四段
海-陆过渡沉积体系	海-陆过渡相三角洲	河控三角洲	三角洲平原、三角洲前缘、前三角洲	砾粗砂岩、粗砂岩、细砂岩沉积，中-高砂地比，岩屑砂岩为主；箱形和漏斗形组合	须二段、须三段

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Depositional responses of Xujiahe Formation to the uplifting ofLongmenshan during the Late Triassic, Western Sichuan Depression

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