论文部分内容阅读
以层序地层学理论为基础 ,综合利用岩心、录井、测井及地震资料 ,进行塔里木盆地台盆区三叠系层序地层学研究。识别出 5个以不整合面为边界的三级层序 ,层序Ⅰ、层序Ⅱ和层序Ⅲ位于下三叠统 ,层序Ⅳ相当于中三叠统 ,层序Ⅴ相当于上三叠统。层序Ⅰ由低位体系域、水侵体系域和高位体系域构成 ,低位体系域分布在塔中低凸起和满加尔凹陷中南部 ,塔中地区、满西 1井和满参 1井处为辫状河三角洲沉积 ,水侵体系域广布整个台盆区 ,为半深湖—深湖沉积 ,高位体系域仅保存在塔北隆起的低洼部位。层序Ⅱ由水侵体系域和低位体系域组成 ,主要为湖泊相沉积。层序Ⅲ分布在塔中低凸起和整个满加尔凹陷 ,为辫状河沉积。层序Ⅳ由低位体系域和水侵体系域构成 ,塔中地区为曲流河沉积 ,满加尔凹陷—塔北隆起为辫状河三角洲—湖泊沉积。层序Ⅴ由低位体系域和水侵体系域构成 ,为扇三角洲—湖泊相沉积 ,分布在塔北隆起和满加尔凹陷的北坡 ,塔中地区缺失。三叠系各层序的形成主要与构造运动、湖平面变化、物源供给有关。根据层序格架内沉积体系的分布规律及已知油气田的生储盖组合 ,预测塔北隆起草湖凹陷北部靠近轮台断隆处是发育扇三角洲储集层的有利部位 ,塔中低凸起西段的中、下三叠统辫状河三角洲分支河道砂体也是有利储集层?
Based on the theory of sequence stratigraphy, the study of the Triassic sequence stratigraphy in the basin basin of the Tarim Basin was conducted by comprehensively using the core, logging, logging and seismic data. Five third-order sequences with unconformities as boundary are identified. The sequence Ⅰ, the sequence Ⅱ and the sequence Ⅲ are located in the Lower Triassic. The sequence Ⅳ is equivalent to the middle Triassic. The sequence V is equivalent to the third Stacks. The sequence Ⅰ consists of low-level system tract, water-intrusion system tract and high-level system tract. The low-level system tract distributes in lowstands in the middle Tarim Basin and central-southern Manjar Sag. In Middle Tazhong area, Manxi-1 well and Man-sheng-1 well, Braided river delta sediments, water-transgressive systems widely distributed throughout the basin area, as a semi-deep lake - deep lake sediments, high system tract only preserved in the Tabei uplift of the low-lying parts. Sequence II consists of water-invaded systems tract and lowstand system tract, mainly lacustrine facies. Sequence Ⅲ is located in the tower low bumps and the entire Manjiaer depression, braided river sediments. The sequence Ⅳ consists of low-level system tract and water-intrusion system tract. The Tazhong area is meandering river, and Manjiaer depression-Tabei uplift is braided river delta-lake sedimentary. Sequence V consists of low-level system tract and water-intrusion system tract, and is fan-delta-lacustrine facies, which is located on the northern slope of Tabei uplift and Manjar sag and is missing in central Tarim basin. The formation of Triassic sequences is mainly related to tectonic movement, lake level change and source supply. According to the distribution law of sedimentary system in the sequence framework and the reservoir-cap assemblage of known oil and gas fields, it is predicted that the northern part of Caohu depression in Tarim uplift near Rintan is favorable for developing fan delta reservoirs. The middle and lower Triassic Braided River Delta channel sand bodies in the western segment are also favorable reservoirs?