准噶尔盆地东北缘中-下侏罗统层序地层与油气  

SEQUENCE STRATIGRAPHY OF LOWER MIDDLE JURASSIC AND PETROLEUM IN THE NORTHEAST JUNGGAR BASIN, XINJIANG, CHINA

作　　者：方国庆[1] 李育慈[1] 刘德良[2] 

机构地区：[1]中国科学院兰州地质研究所,兰州730000 [2]中国科学技术大学地球与空间科学系,合肥230026

出　　处：《地质科学》2000年第4期414-421,共8页Chinese Journal of Geology(Scientia Geologica Sinica)

摘　　要：通过对边缘露头、钻井和地震等资料的综合层序地层分析 ,划分出下八道湾、上八道湾、三工河和西山窑等 4个层序以及湖退体系域 (RST)、湖进体系域 (TST)、高位体系域(HST)和冲积体系域 (AST)等四种类型的 9个体系域。层序形成主要受控于构造作用和湖水进退。RST中形成区域上广布的工业煤层 ;TST中的粗粒退积型辫状三角洲沉积体系中发育很好的储层。快速湖进形成的 TST与构造长期稳定形成的Based on the integrated research of outcrops, wells and seismic data, one magasequence and four third order sequnces and nine system tracts have been identified in the Middle Lower Jurassic of the Northeast Junggar Basin, Xinjiang, China. Different from the marine sequence, there are four types of system tracts recognized which are lacustrine transgressive system tracts (TST),lacustrine regressive system tracts (RST), highstand system tracts(HST) and alluvial system tracts(AST). The main factors controlling sequence development are tectonics and lacustrine regression or transgression, which controlled the sequence stratigraphic features. Sequence boundaries SB 1, SB 3 and SB 5 were formed under the faster lacustrine regression and active tectonic setting, SB 2,SB 4 and system tracts RST 2 and RST 4 under the gently lake regression and weak tectonic setting, TST 1 and TST 3 under the faster lacustrine transgression and active tectonic setting, HST under the stable both lake water and tectonic and AST during alluvial deposit after extinct lake. There are good reservoirs in the retrograding braided delta depositional system among the TST, in which porosity is about 20% and permeability about 200 mD. Under the lake transgression and provenance uplift, the braided delta depositional system was developed in the transformed zone between the alluvial depositional system and the lacustrine depositional systems, because of the strong water energy, most of the matrix can be sorted off. The lacustrine mudstones among the HST is good source rocks, especially the mudstone of HST 3 is typical condensed section, which is pure and its thickness is about one hundred meters. The multi superimposed HST and TST created good source reservoir cap assemblages.

关 键 词：陆相层序地层 油气 侏罗系 准噶尔盆地 

分 类 号：P618.130.1[天文地球—矿床学]