摘要
【研究目的】塔里木盆地台盆区中寒武统发育大面积的膏盐岩、膏质泥岩和膏质云岩地层,探讨该套地层的油气封盖能力和展布可为塔里木盆地寒武系盐下领域的勘探提供依据。【研究方法】对4口井的44个岩心样品进行镜下薄片、物性参数和突破压力测试。通过建立各参数之间的关系,定量地对研究区中寒武统不同岩性岩石的封盖能力进行评价;结合二维地震和14口钻井资料对研究区中寒武统膏盐岩、膏质泥岩和膏质云岩地层的厚度进行研究;最终综合研究区中寒武统微观和宏观的评价结果,并以实际钻井的勘探情况作为约束,建立针对该研究区盖层封盖能力的综合评价方式。【研究结果】研究结果认为膏盐岩相比膏质泥岩与膏质云岩具有更好的封盖能力,但断裂和石膏的埋藏地质条件会影响盖层的封盖能力。其中阿瓦提凹陷、塔中隆起北部、满西低凸起南部以及巴楚隆起中北部膏盐岩盖层厚度较大,以巴楚隆起北部为中心,膏盐岩厚度向四周呈不规则状递减,环绕状分布。【结论】认为阿瓦提凹陷、满西低凸起西部和南部、塔中隆起北部和西部,以及塔北隆起中部为盖层发育的有利区。
This paper is the result of oil and gas exploration engineering.[Objective]Gypsum-salt rocks, gypsum-bearing mudstone, and gypsum-bearing dolomite were extensively deposited in the platform-basin area of Tarim Basin during the Middle Cambrian. The study on the oil and gas sealing capacity and distribution of this set of strata can provide a basis for the exploration of the Cambrian subsalt field in the Tarim Basin. [Methods]44 core samples from 4 wells were studied under microscopic thin sections and tested for physical parameters and breakthrough pressure. Based on the relationship among physical parameters, the sealing ability of the Middle Cambrian rocks in the study area was quantitatively evaluated. Meanwhile, we studied the thicknesses of the Middle Cambrian gypsum-salt rocks, gypsum-bearing mudstone, and gypsum-bearing dolomite using two-dimensional seismic data and drilling data from 14 wells. The microscopic and macroscopic appraisals of Middle Cambrian successions are constrained by drilling data obtained during exploration. Finally, we proposed a comprehensive method to evaluate the sealing ability of the caprock.[Results]The results suggest that gypsum-salt rocks have better sealing ability than gypsum-bearing mudstone and gypsum-bearing dolomite, but the faults and burial condition will affect the sealing ability of the caprock. It shows that the thicknesses of the gypsum caprocks are great in the Awati Depression, the north of the Tazhong Uplift, the south of the Manxi Low Uplift, and the middle and north of the Bachu Uplift. The thinness of gypsum is greatest in the Bachu Uplift and decreases unevenly towards the surrounding areas. [Conclusions]The research results show that the Awati Depression, the West and south of Manxi Low Uplift, the north and west of Tazhong Uplift, and the middle of Tabei Uplift are favorable areas for the development of the caprock.
作者
季天愚
杨威
武雪琼
蒲仁海
李德江
刘满仓
缪卫东
苏楠
叶颖
JI Tianyu;YANG Wei;WU Xueqiong;PU Renhai;LI Dejiang;LIU Mancang;MIAO Weidong;SU Nan;YE Ying(Research Institute of Petroleum Exploration Development,PetroChina,Beijing 100083,China;State Key Laboratory of Continental Dynamics,Dept.of Geology,Northwest University,Xi’an 710069,Shaanxi,China;4th Production Plant Huabei Oilfield,Petrochina,Langfang 065000,Hebei,China)
出处
《中国地质》
CAS
CSCD
北大核心
2022年第2期369-382,共14页
Geology in China
基金
国家科技重大专项“大型油气田及煤层气开发”(2016ZX05007-002)资助。
关键词
石油天然气
中寒武统
膏盐岩
盖层
封闭性
油气勘查工程
塔里木盆地
oil and gas
Middle Cambrian
gypsum salt rock
caprock
sealing ability
oil and gas exploration engineering
Tarim Basin
