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首页> 外文期刊>Journal of Asian earth sciences >Sequence stratigraphy, sedimentary systems and petroleum plays in a low-accommodation basin: Middle to upper members of the Lower Jurassic Sangonghe Formation, Central Junggar Basin, Northwestern China
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Sequence stratigraphy, sedimentary systems and petroleum plays in a low-accommodation basin: Middle to upper members of the Lower Jurassic Sangonghe Formation, Central Junggar Basin, Northwestern China

机译：低适应盆地的层序地层，沉积体系和石油开采：准：尔盆地中部下侏罗统三工河组中上段

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摘要

The Lower Jurassic Junggar Basin is a low-accommodation basin in northwestern China. Because of low subsidence rates and a warm, wet climate, deposits of the Central subbasin of the Junggar Basin formed from fluvial, deltaic, shallow lake facies. Sequence stratigraphy and sedimentary systems of the Lower Jurassic members of the Sangonghe Formation (J(1)s) were evaluated by observing cores, interpreting wireline logs and examining seismic profiles. Two third-order sequences were recognized in the strata. The distribution of the sedimentary systems in the systems tracts shows that tectonic movement, paleorelief, paleoclimate and changes in lake level controlled the architecture of individual sequences. During the development of the lowstand systems tract (LST), the intense structural movement of the basin resulted in a significant fall in the water level in the lake, accompanied by rapid accommodation decrease. Braided rivers and their deltaic systems were also developed in the Central Junggar Basin. Sediments carried by braided rivers were deposited on upward slopes of the paleorelief, and braid-delta fronts were deposited on downward slopes. During the transgressive systems tract (TST), the tectonic movement of the basin was quiescent and the climate was warm and humid. Lake levels rose and accommodation increased quickly, shoal lines moved landward, and shore- to shallow-lake deposits, sublacustrine fans and deep-lake facies were deposited in shallow- to deep-lake environments. During the highstand systems tract (HST), the accommodation no longer increased but sediment supply continued, far exceeding accommodation. HST deposits slowly formed in shallow-lake to meandering river delta-front environments. Relatively low rates of structural subsidence and low accommodation resulted in coarse-grained successions that were fining upward. Deposits were controlled by structural movement and paleorelief within the LST to TST deposits in the Central subbasin. Fine- to medium-grained coarsening-upward successions developed during the HST. The sand bodies of braid-delta fronts on the downward slopes of the paleorelief in the LST and the sublacustrine fans in the TST became reservoirs for hydrocarbon accumulation. Petroleum plays have only been found in the Sangonghe Formation (J(1)s) located on structural ridges that consist of sand bodies comprising these sequences. Favorable conditions for petroleum plays in HST1-LST2 occur where the sand bodies have been fractured by faults and sealed by denudation and pinch-out lines, then overlain by deep lake mudstone in TST2. The favorable condition of the sand bodies within TST2 occurs where isolated sand bodies have been fractured by faults. (C) 2015 Elsevier Ltd. All rights reserved.
机译：下侏罗统准gar尔盆地是中国西北部的低适应盆地。由于低沉陷率和温暖湿润的气候，准gar尔盆地中部盆地的沉积物由河流，三角洲，浅湖相形成。通过观察岩心，解释电缆测井资料和检查地震剖面，对三工河组（J（1）s）下侏罗统层序地层和沉积体系进行了评估。在层中识别出两个三阶序列。沉积系统在系统区域中的分布表明，构造运动，古浮雕，古气候和湖泊水位的变化控制着各个序列的构造。在低水位系统道（LST）的开发过程中，流域的强烈结构运动导致湖中水位明显下降，并伴随着快速的住所减少。准Jung尔中部盆地也发展了辫状河及其三角洲系统。辫状河携带的沉积物沉积在古隆起的向上斜坡上，而辫状三角洲锋则沉积在向下的斜坡上。在海侵系统时期（TST），盆地的构造运动是静止的，气候温暖湿润。湖泊水位上升，住宿迅速增加，浅滩线向内移动，岸到浅湖沉积物，湖底扇和深湖相沉积在浅至深湖环境中。在高位系统风道（HST）期间，容纳量不再增加，但沉积物供应仍在继续，远远超出容纳量。 HST沉积物在浅湖至蜿蜒的三角洲前缘环境中缓慢形成。相对较低的结构沉降率和较低的适应性导致了粗粒度的演替逐渐上升。沉积物受中央次盆地中LST到TST沉积物内部的构造运动和古沉积的控制。在HST期间出现了中细粒度的向上粗化演替。 LST古隆起下坡的辫状三角洲前缘砂体和TST的湖底扇成为砂岩油气成藏的储集层。仅在位于由包含这些层序的砂体组成的结构脊上的三工河组（J（1）s）中发现了石油矿床。 HST1-LST2中石油的有利条件发生在断层使砂体破裂，剥蚀和挤压线将其封闭，然后在TST2中被深湖泥岩覆盖的情况。 TST2内砂体的有利条件发生在孤立的砂体因断层而破裂的地方。 （C）2015 Elsevier Ltd.保留所有权利。

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