博格达山前带米泉地区滑脱逆冲构造样式及其演化特征

doi:10.7657/XJPG20200101

摘要/Abstract

摘要：

为确定博格达山前米泉地区构造样式和地层展布,基于断层发育特征及滑脱层对构造发育控制作用的研究,建立了研究区典型的滑脱逆冲构造样式。受上三叠统泥岩和下侏罗统八道湾组煤系滑脱层的控制,米泉地区的基底断层早期沿滑脱层由南向北低角度滑冲,后期遇阻上倾,切割地层并出露地表,形成独特的“躺椅”状产状;次级断层规模小,两端止于滑脱层内。博格达山前带自南向北划分为推覆带（基底推覆）、冲断带和滑脱带3大构造带。米泉地区位于冲断带,横向可细分为4个构造台阶,纵向上划分为3个构造层,各构造层均为主动顶板双重构造复合体,次级断层发育程度有所差别。滑脱逆冲构造样式的建立推翻了以往的构造认知,确立了推覆体下方仍为下组合地层,且存在众多有利的背斜圈闭的地质认识,对准噶尔盆地南缘山前带下组合的油气勘探具有借鉴意义。

关键词: 准噶尔盆地, 米泉地区, 逆冲滑脱构造, 滑脱层, 上三叠统, 下侏罗统, 推覆带, 冲断带, 滑脱带, 下部成藏组合

Abstract:

To determine the structural style and stratum distribution in the Miquan area in the piedmont of Bogda Mountain, the paper establishes a typical thrust decollement style in the study area based on the study of the fault development characteristics and the controls of detachment layer on structure development. Restricted by the Upper Triassic mudstone and the detachment coal layer in the Lower Jurassic Badaowan formation, the basement fault which underwent a low-angle slip and thrust from south to north along the detachment layer at the early stage and a updip at the late stage incised into the strata and exposed on the surface, and displayed a unique deckchair-like shape. The secondary faults are of small scale, whose ends are located in the detachment layer. The piedmont of Bogda Mountain is divided into 3 large structural belts such as nappe belt (basement nappe), thrust belt and decollement belt. Miquan area located in the thrust belt can be divided into 4 structural steps laterally and 3 structural layers vertically. Each structural layer is an active-roof duplex and the development degrees of the secondary faults are different from each other. The establishement of the thrust decollement style has overturned the preliminary understanding about the structures. It is considered that the strata under the nappe still belong to the lower reservoir-forming combination where many favorable traps could be discovered. The understanding has great significance for petroleum exploration in the lower combination in the piedmont of the southern margin, Junggar basin.

Key words: Junggar basin, Miquan area, thrust decollement, detachment layer, Upper Triassic, Lower Jurassic, nappe belt, thrust belt, decol-lement belt, lower reservoir-forming combination

中图分类号:

TE121.2

杨玉龙. 博格达山前带米泉地区滑脱逆冲构造样式及其演化特征[J]. 新疆石油地质, 2020, 41(1): 1-8.

YANG Yulong. Style and Evolution of Thrust Decollement in Miquan Area in Piedmont of Bogda Mountain[J]. Xinjiang Petroleum Geology, 2020, 41(1): 1-8.

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