塔中隆起中-上奥陶统之间的不整合成因机制  

Unconformity mechanisms between the Middle and Upper Ordovician in Tazhong uplift

作　　者：李京昌[1] 张智礼[1] 宋海明[1] 蔡习尧[1] 马庆佑[2] 郭欣[2] 

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石化西北油田分公司石油勘探开发研究院,乌鲁木齐830011

出　　处：《地质科学》2016年第2期510-520,共11页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：中国石油化工股份有限公司科技部项目“塔里木中央隆起构造解析与物理、数值模拟研究”（编号：P15089）资助.

摘　　要：塔里木盆地众多岩溶储层不整合中，中-上奥陶统之间的不整合研究意义重大。本文以塔中隆起中-上奥陶统之间的不整合结构特征为依据，对不整合成因机制进行了分析。研究表明，发生在恰尔巴克组沉积期间的地壳褶皱作用控制了不整合的发育，其分布范围受背斜控制。在背斜区，不同层系缺失的原因存在差异，一间房组和鹰山组的缺失是剥蚀缺失，而恰尔巴克组的缺失是沉积缺失。成因上可将其不整合划分为同构造型和后构造型两种不整合类型。同构造不整合分布在塔中背斜型隆起两翼的恰尔巴克组与一间房组之间，后构造不整合分布在塔中背斜型隆起顶部的良里塔格组与鹰山组之间。It is the most important unconformity among the numerous unconformities may causing Karst reservoir in Tarim Basin that was developed between the Middle and Upper Ordovician. Based on the structural characteristics of the unconformity in Tazhong uplift, the origin mechanisms of the unconformity are analyzed. Studies show that crustal-scale folding controlls the development of the unconformity between the Middle and Upper Ordovician during Qiaerbake deposition period, and the unconformity distribution is controlled by anticline zone. All the stratigraphic hiatus in the anticlinal zone is not caused by denudation, in which only the hiatus in Yingshan and Yijianfang Formations were caused by denudation, but the hiatus was caused by without deposition in Qiaerbake Formation showing differences reasons in resulting the stratigraphic hiatus. It can be divided the unconformity between the Middle and Upper Ordovician into two types, that are syn-tectonicunconformity and post-tectonic unconformity. The syn-tectonicunconformity was developed between Qiaerbake Formation and Yijianfang Formation distributing in the limb of Tazhong anticlinal uplift. The post-tectonic unconformity was developed between Lianglitage Formation and Yingshan Formation distributing in the top of Tazhong anticlinal uplift.

关 键 词：塔里木盆地 不整合面 成因机制 中-上奥陶统 

分 类 号：P511.1[天文地球—地质学]