鄂尔多斯盆地白豹地区三叠系延长组长6段滑塌变形特征研究  

Slump sedimentary characteristics of the Triassic Chang 6 reservoir from the Baibao Area,Ordos Basin

作　　者：巨银娟[1] 张小莉[1] 

机构地区：[1]西北大学地质学系/大陆动力学国家重点实验室,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2016年第1期87-93,共7页Journal of Northwest University（Natural Science Edition）

基　　金："十一五"国家科技支撑计划基金资助项目(2007BAB170)

摘　　要：对鄂尔多斯盆地白豹地区14口井长6段约950 m长的岩心中普遍发育的滑塌变形进行详细的观察统计,在岩心标定的基础上综合薄片观察、测井、录井以及物性分析等资料,以研究白豹地区长6段滑塌变形的沉积特征、类型、分布规律及成因机制。研究后认为,沉积物自身的重力是发生滑塌变形的根本动力,坡折带及其以上的泥质薄弱层是滑塌沉积的必要条件。滑塌面上部地层中多见滑塌角砾岩、滑塌裂缝等大强度脆性变形,而砂岩脉(肠)、火焰构造、重荷模等塑性变形多发育在滑塌面附近的砂泥岩互层中,纯泥岩中可见滑塌褶皱。统计表明,研究区各井中长6段滑塌变形在东西方向上数量明显多于南北方向,而且东西向各井中的滑塌变形严格限定在岩性地层单元内且南北方向具有穿层特征,这说明该区滑塌沉积主要沿近南北方向发生。To summarize the slump sedimentary features in the Chang 6 reservoir. According the detailed core observations of 950 m from 14 wells in the Baibao area, slump deformations are well developed in all the cores. In combination with the data from well logging, physical property and thin section, the sedimentary fea- tures, genetic types, distribution patterns and origin of the slump sediments were analyzed in the Chang 6th reservoir. The compacting force in the sedimentary process and muddy weak plane play the predominant role in the slump process. The brittle deformations, i. e. , slump breccia and cracks, are well developed in the upper plane, well the ductile deformations, including the sandstone dikes, flamy structure and load cast well devel- oped in the slump plane. The statistical data indicate that slump deformations along the E-W direction are more than those in N-S direction. Slump deformations along the E-W direction are restricted in single lithologic unite, the sump deformations alone the N-S direction can cross many different lithologic unites, this features indicate that the slump process mainly takes place along the N-S direction.

关 键 词：白豹长6段 滑塌变形 深水重力流 滑塌沉积 重力失衡 薄弱带 

分 类 号：P512.2[天文地球—地质学]