塔里木盆地震旦纪末地层—地貌格架与寒武纪初期烃源岩发育模式

发布时间：2018-05-12 17:16

  本文选题：塔里木盆地 + 震旦系　； 参考：《天然气地球科学》2017年02期

【摘要】：通过补充重点钻井前寒武系火山碎屑岩样品的锆石U—Pb定年,开展震旦纪一寒武纪初期地层对比研究,在震旦纪末古地貌格架基础上建立寒武纪初期烃源岩发育模式,并根据地震相特征推测烃源岩分布。锆石年代学结果显示T1井底火山碎屑岩样品的最年轻谐和年龄为707±8Ma,地层时代宜归南华系。寒武系底界(T_9~0面)上下地层格架显示,震旦纪末期古地貌具有以巴楚、塔中一带为隆起高地,南高北低、西高东低的特征。在古台地和斜坡部位,寒武系底部烃源岩的分布与上震旦统白云岩有较好的一致性,在古隆起及其边缘表现为沉积缺失或相变。从T_9~0界面以下地震相特征推测,西山布拉克组∈_1xs烃源岩主要分布在满加尔坳陷,而玉尔吐斯组∈_1y烃源岩在柯坪—塔北隆起、阿瓦提坳陷东部和顺托果勒地区都有分布。巴楚—塔中地区存在多个前南华系基底古隆起,广泛缺失寒武纪初期地层,整体烃源岩发育条件欠佳。麦盖提斜坡南华系—震旦系厚度大、分布广,可能有寒武系底部烃源岩分布。
[Abstract]:By supplementing the zircon U-Pb dating of the Precambrian pyroclastic samples, the stratigraphic correlation of the Sinian to the early Cambrian is carried out, and the early Cambrian source rock development model is established on the basis of the paleogeomorphic framework at the end of the Sinian. The distribution of hydrocarbon source rocks is estimated according to the characteristics of seismic facies. The results of zircon chronology show that the youngest harmonic age of pyroclastic samples at the bottom of T1 is 707 卤8 Ma.The stratigraphic age is suitable for the Nanhua series. The upper and lower stratigraphic framework of Cambrian bottom boundary shows that the late Sinian paleogeomorphology is characterized by Bachu, Tazhong uplift, south high and north low, and west high and east low. In the paleoplatform and slope, the distribution of the source rocks at the bottom of the Cambrian is consistent with that of the dolomite of the Upper Sinian, and the distribution of the source rocks in the paleoplatform and the slope is characterized by sedimentary absence or phase transformation at the paleouplift and its edge. It is inferred from the seismic facies characteristics below the interface of T _ 9 / O that the source rocks of the Xishanburak formation 鈭，

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