發(fā)布時間：2018-05-12 17:16

  本文選題：塔里木盆地 + 震旦系　； 參考：《天然氣地球科學(xué)》2017年02期

【摘要】：通過補(bǔ)充重點(diǎn)鉆井前寒武系火山碎屑巖樣品的鋯石U—Pb定年,開展震旦紀(jì)一寒武紀(jì)初期地層對比研究,在震旦紀(jì)末古地貌格架基礎(chǔ)上建立寒武紀(jì)初期烴源巖發(fā)育模式,并根據(jù)地震相特征推測烴源巖分布。鋯石年代學(xué)結(jié)果顯示T1井底火山碎屑巖樣品的最年輕諧和年齡為707±8Ma,地層時代宜歸南華系。寒武系底界(T_9~0面)上下地層格架顯示,震旦紀(jì)末期古地貌具有以巴楚、塔中一帶為隆起高地,南高北低、西高東低的特征。在古臺地和斜坡部位,寒武系底部烴源巖的分布與上震旦統(tǒng)白云巖有較好的一致性,在古隆起及其邊緣表現(xiàn)為沉積缺失或相變。從T_9~0界面以下地震相特征推測,西山布拉克組∈_1xs烴源巖主要分布在滿加爾坳陷,而玉爾吐斯組∈_1y烴源巖在柯坪—塔北隆起、阿瓦提坳陷東部和順托果勒地區(qū)都有分布。巴楚—塔中地區(qū)存在多個前南華系基底古隆起,廣泛缺失寒武紀(jì)初期地層,整體烴源巖發(fā)育條件欠佳。麥蓋提斜坡南華系—震旦系厚度大、分布廣,可能有寒武系底部烴源巖分布。
[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 鹵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，

本文編號：1879456