塔里木盆地中寒武统膏盐岩分布及封闭性评价

doi:10.3969/j.issn.1672-7703.2023.05.005

摘要/Abstract

摘要： 塔里木盆地中寒武统发育膏盐岩，其分布及封闭性对深层油气勘探具有重要意义。基于录井和测井资料、地震资料、测试资料，分析了塔里木盆地中寒武统膏盐岩分布特征，并根据岩石类型（如盐岩、膏岩、含膏岩）、埋藏深度和构造变形强度，对膏盐岩盖层品质进行评价。研究结果表明：塔里木盆地中寒武统膏盐岩沉积序列由盐岩、膏岩、含膏岩、白云岩、石灰岩和泥岩组成，主要分布在塔里木盆地中部地区，盐岩分布范围小，位于中心部位，膏岩分布范围稍大，含膏岩分布范围最大，具有牛眼式沉积特点；北部坳陷中西部、中央隆起中西部大部分地区、西南坳陷西部北斜坡发育好膏盐岩盖层，中央隆起中部部分地区和西南坳陷东部西北构造带北部发育中等膏盐岩盖层，塔北隆起中部和西南坳陷东部西北构造带南部发育差膏盐岩盖层。

关键词: 塔里木盆地, 中寒武统, 膏盐岩, 盖层, 评价

Abstract: The gypsum-salt rocks are developed in the Middle Cambrian in Tarim basin, and their distribution and sealing capacity are of great significance for the petroleum exploration in deep formations. By using mud logging, wireline logging, seismic, and well test data, the distribution and sealing capacity of gypsum-salt rocks are analyzed. Furthermore, the quality of gypsum-salt cap rock is evaluated from the perspective of rock type (i.e., salt rock, gypsum rock, and gypsum-bearing rock), burial depth, and tectonic deformation intensity. The study results indicate that: (1) The sedimentary sequence of gypsum-salt rocks in the Middle Cambrian in Tarim Basin is composed of salt rock, gypsum rock, gypsum-bearing rock, dolomite, limestone and mudstone, which is mainly distributed in the central Tarim Basin, with a small distribution range of salt rocks only in the central part, a slightly larger distribution range of gypsum rocks, and a largest distribution range of gypsum-bearing rocks, showing the characteristics of bull-eyed deposition pattern; (2) The superior gypsum-salt cap rocks are developed in the central-western Northern Depression, most areas in the central-western Central Uplift, and the north slope in the western part of Southwestern Depression; The medium-quality gypsum-salt cap rocks are developed in local areas in the central part of Central Uplift and the northern part of northwest structural belt in the eastern Southwestern Depression; The poor gypsum-salt cap rocks are developed in the central Tabei Uplift and the southern part of northwest structural belt in the eastern Southwestern Depression.

中图分类号:

TE112.25

徐振平, 陈书平, 杨宪彰, 杨果, 徐世东, 胡方杰, 娄洪, 吕惠贤. 塔里木盆地中寒武统膏盐岩分布及封闭性评价[J]. 中国石油勘探, 2023, 28(5): 54-67.

Xu Zhenping, Chen Shuping, Yang Xianzhang, Yang Guo, Xu Shidong, Hu Fangjie, Lou Hong, Lv Huixian. Distribution and sealing capacity evaluation of gypsum-salt rocks in the Middle Cambrian in Tarim Basin[J]. China Petroleum Exploration, 2023, 28(5): 54-67.

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