云安厂构造带地质特征及下一步勘探目标  

Geologic characteristics of Yun'anchang structural zone and the targets for future exploration

作　　者：党录瑞[1] 李瑜[1] 郑超[1] 李爽[1] 朱宜新[1] 文其兵[1] 

机构地区：[1]中国石油西南油气田公司重庆气矿

出　　处：《天然气工业》2009年第10期17-20,共4页Natural Gas Industry

摘　　要：由于勘探投入不足及高陡复杂构造勘探目标选择难度较大等原因,四川省东部地区石炭系的天然气勘探在近十多年有所停滞。为此,选择该区内勘探程度不高的云安厂构造带,研究其构造特征、储层分布特征及构造模式,并重点分析了区域范围内的勘探失利井。综合分析该构造带实钻井剖面,结合构造形成机理研究,认为云安厂构造带的构造模式应为挤压抬升倒转型。根据该构造带东、西两段构造格局的对比分析认为,主体西段为"上冲型半背斜圈闭",东段为"断垒型背斜圈闭"。西段主地层相对封闭性较差,有效圈闭受溢出点控制;东段由于属较为对称的断垒型构造,在抬升过程中形成的断层封闭性较好,能较大范围地形成有效圈闭。研究结果表明,云安厂下一步勘探的有利油气聚集区为:①主体构造东段的白杨湾—天乾坪高带;②构造带东南翼断下盘的沙塘潜伏构造。The gas exploration in the Carboniferous in eastern Sichuan Basin is stagnant in recent ten years due to insufficient exploration investment and difficulty in the identification of exploration targets in areas with complex and steep structures.Therefore,the poorly-explored Yun'anchang structural zone is selected for the study of the structural features,reservoir distribution and structural model in this Carboniferous area,and the dry wells in this zone are the focus of the study.Based on a comprehensive analysis of the sections established according to the drilling data and in combination with a research into the mechanisms of structure formation,the structural model in this zone is believed to be a compressional uplifting and inversion type.A comparative analysis of the structural frameworks in the eastern and western parts of the structure zone reveals that the western part is 'a semi-anticlinal trap of thrusting type',while the eastern part is 'an anticlinal trap of faulted horst type'.In the western part,the sealing capacity is comparatively poor and the effective trap is controlled by the spill point.On the contrary,in the eastern segment,the fault sealing capacity is stronger,thus the effective trap is larger in area.This analysis shows that two favorable exploration targets are identified in the Yun'anchang structural zone:the structural high of the Baiyangwan-Tianqianping in the eastern part and the Shatang buried structure in the foot-wall of fault in the southeastern limb of the structural zone.

关 键 词：川东 石炭纪 勘探 云安厂 构造模式 失利井 勘探目标 

分 类 号：P618.13[天文地球—矿床学] P618.130.2[天文地球—地质学]