Turbidity Current Deposits and Their Significance for Petroleum Geology of Upper Triassic in the Kuqa Depression
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摘要: 库车坳陷中部上三叠统发育了一套的典型的浊积岩系，既有代表浊流沉积特征的多种底痕构造，又有特征的鲍玛序列，浊流沉积通过坳陷东北部的辫状河三角洲前缘陡坡带进入盆地中心，由于晚三叠世处在稳定的坳陷沉降阶段，加之湖盆底部地形平缓，因而浊积岩系相对较薄，仅发育Ｄ相一个浊积岩相，显然这是一种典型的远源浊积岩。与浊积岩共生的深湖相烃源岩和辫状河三角洲相储集层及盖层十分发育，从而证实本区中生界有着良好的油气勘探远景。Abstract: A set of very typical turbidite sequence is developed in the middle of Kuqa depression. Among therocks, mark structures showing turbidty features frequently occur and have charaterlstic Bouma se-quence. Turbidity deposits passing through the scarp zone of braid delta front in the northeast Kuqa de-pression enter the centre of the basin. As the Late Triassic is a stable subsiding stage of the depressionand the landform of lakebed is smooth, turbidte sequenceis relatively thinner and only D turbiditefaciesis developed. Obviously it is a very typical distal turbidite. Hydrocarbon source rocks of deep lake faciesand reservoirs of braid deltas and cap rocks associated with turbidite are well developed. It has beenproved that M esozoic strata have good potentials for exploration of oil and gas in this region.
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