塔里木盆地巴楚断隆油气勘探模式

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塔里木盆地巴楚断隆的油气勘探获得了实质性进展,已发现巴什托普、山1井油气藏和玛4井高产气藏。巴楚地区在早古生代是稳定沉降的克拉通内坳陷;晚古生代发生东西向翘倾活动,石炭纪中、晚期巴楚地区西部形成低隆;中生代开始反转隆升,侏罗纪至白垩纪整体隆升,形成巴楚断隆雏形;在新生代逆掩推覆及断褶活动作用下,形成两褶、一凸、一垒、一向斜的构造格局,成为塔西南前陆盆地的前缘隆起。目前巴楚断隆已知存在3套含油气系统,各自应有不同的勘探模式:寒武系—下奥陶统含油气系统,主要勘探对象是晚第三纪—第四纪聚集的气藏和海西期聚集的古油藏,难点是恢复与分析古构造,研究保存条件;中、上奥陶统含油气系统,以寻找晚第三纪以来形成的气藏为主,应选择较简单的背斜钻探;石炭系含油气系统,主要目的层是石炭系、二叠系和上第三系等,应选择断隆南带靠近斜坡的断层伴生背斜钻探,寻找气藏和轻质油油藏。巴楚断隆及邻区已发现2种成藏组合(石炭系断层相关背斜油藏成藏组合和下奥陶统风化壳气藏成藏组合),还有3种概念型成藏组合(寒武系—下奥陶统内幕原生古油藏,石炭系灰岩断背斜油藏,上二叠统砂岩成藏组合)值得重视。按照3种勘探模式和5种成藏组合类型进行巴楚断隆下一步勘探,? Substantial progress has been made in oil and gas exploration in the Bachu fault basin in the Tarim Basin. High-yield gas reservoirs such as Bashishopu, Shan-1 well and Ma-4 well have been discovered. The Bachu area was stable craton in the Early Paleozoic. The Late Paleozoic occurred east-west trending activities. In the middle and late stages of Carboniferous, the formation of low-latitudes was formed in the western Bachu area. The Mesozoic began to reverse uplift, from the Jurassic to the Cretaceous During the Cenozoic thrusting and fold-breaking activities, a double-fold, a convex, a first-base and a diagonal tectonic structure was formed, which became the front of the Tazhong foreland basin Edge uplift. At present, there are three sets of hydrocarbon-bearing systems known to exist in Bachu Discontinuity, each with different exploration modes: the Cambrian-Lower Ordovician hydrocarbon-bearing system, and the main exploration target is the late-Tertiary-Quaternary gas pool And the Hercynian paleo-oil reservoirs, the difficulty is to restore and analyze the paleotectonics and to study the preservation conditions. The middle and upper Ordovician oil and gas systems are mainly gas reservoirs formed since the late Tertiary, and should be simpler Of the anticline drilling; Carboniferous petroleum system, the main target layer is the Carboniferous, Permian and Upper Tertiary, etc., should be selected near the slope of the fault rupture associated with anticline drilling, looking for gas reservoirs and light oil Reservoir. Two kinds of hydrocarbon accumulation assemblages (Carboniferous fault-related anticline reservoir assemblages and Lower Ordovician weathering crust gas reservoirs) have been discovered in the Bachu fault and its adjacent areas. There are also three types of conceptual reservoir assemblages ( Cambrian-Lower Ordovician intrusive primary reservoir, Carboniferous limestone faulted anticline reservoirs and Upper Permian sandstone reservoirs are worthy of attention. According to the three exploration patterns and five types of reservoir assemblages for the next exploration Bachu fault?
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