论文部分内容阅读
通过笔石划分孔雀河斜坡孔探1井奥陶系生物地层序列。黑土凹组上段灰黑色泥页岩属弗洛阶—达瑞威尔阶Acrograptus ellesae带-Undulograptus austrodentatus带,具有高自然伽马特征;下段灰色灰质泥岩属特马豆克阶Adelograptus victoriae-Kiaerograputs kiaeri带,与下伏突尔沙克塔格组黄灰色泥质灰岩分界清晰。黑土凹组—却尔却克组可划分出2个Ⅱ级层序以及4个Ⅲ级层序;3个Ⅱ级层序界面分别为早奥陶世开阔陆棚相向盆地相沉积转变面、中奥陶世盆地相向晚奥陶世浅海陆棚相沉积转换面、加里东晚期—印支期多期构造运动的叠合不整合面。SQ1与SQ2层序的TST与HST体系域为优质烃源岩发育段,SQ3层序的TST体系域也发育烃源岩。
The sequence of Ordovician biogenic stratigraphy of well 1 in Well Peacock River is divided by pen-stone. The gray-black mud shale in the Upper Blackock Formation belongs to the Frederick-Darrevilleian Acrograptus ellesae belt with the Undulograptus austrodentatus belt, which has the characteristics of high natural gamma ray. The lower gray gray mudstone belongs to the Tedelouptor victoriae-Kiaerograputs kiaeri belt , With a clear boundary between the yellowish-gray mudstone and limestone beneath the Lekshaktagh Formation. There are two class Ⅱ and 4 class Ⅲ sequences in the black earth-kurdokuk group. The three class Ⅱ sequence interfaces are the facies-sedimentary facies of the Early Ordovician open-shelf continental basin, Late Ordovician shallow shelf evolution facies in the Ordovician basin, superimposed unconformities in the Late Caledonian - Indosinian tectonic movement. The TST and HST system domains of SQ1 and SQ2 sequences are good source rock development, and the TST system tract of SQ3 sequence also develops source rocks.