| 盐源—宁蒗及邻区重力场特征及其对油气勘探的启示 |
| |
| 引用本文： | 廖国忠,王桥,杨剑,夏时斌,张伟,李华,高慧.盐源—宁蒗及邻区重力场特征及其对油气勘探的启示[J].地质学报,2023,97(8):2621-2632. |
| |
| 作者姓名： | 廖国忠 王桥 杨剑 夏时斌 张伟 李华 高慧 |
| |
| 作者单位： | 中国地质调查局成都地质调查中心，四川成都，610081 |
| |
| 基金项目： | 本文为中国地质调查局项目（编号 DD20190033、DD20211386）和国家自然科学基金项目（编号 418041144）联合资助的成果 |
| |
| 摘 要： | 近年来，随着四川盆地周缘在油气勘探上取得的重大突破，盐源—宁蒗地区成为了新区新层系油气调查的重点研究区域。盐源—宁蒗地区位于扬子地台西缘，其复杂的断裂体系和频繁的构造、岩浆活动，制约着该区油气的生、运、储。鉴于当前油气资源开发所能达到的深度较浅，本文首先利用Crust 1. 0库提供的地球深部结构，采用频率域界面正演的方法获取研究区的区域重力异常，然后将地表布格重力异常减去区域重力异常，获取上地壳激发的剩余重力异常。通过对盐源—宁蒗及邻区的区域剩余重力分布特征的分析，将盐源—宁蒗及邻区在平面上分为Ⅰ区、Ⅱ区、Ⅲ区和Ⅳ区。结合地表地质情况，将最有利于油气资源开发的Ⅳ区采用Parker界面反演对其基底起伏进行反演，进一步将其细分为8个子区。综合分析8个子区基底起伏情况、重力剖面反演和大地电磁测深剖面反演，推测该区为康滇古陆西侧、北东走向的向斜构造；向斜南东翼和金河 箐河断裂之间存在的背斜构造，为有利的油气勘探构造，具有较好的资源潜力。
|
| 关 键 词： | 重力场 Crust 1. 0 大地电磁 盐源 宁蒗 |
| 收稿时间： | 2022/6/14 0:00:00 |
| 修稿时间： | 2022/9/28 0:00:00 |
Characteristics of gravity field from the Yanyuan Ninglang and adjacent area and its implications for oil and gas exploration |
| |
| LIAO Guozhong,WANG Qiao,YANG Jian,XIA Shibin,ZHANG Wei,LI Hu,GAO Hui.Characteristics of gravity field from the Yanyuan Ninglang and adjacent area and its implications for oil and gas exploration[J].Acta Geologica Sinica,2023,97(8):2621-2632. |
| |
| Authors: | LIAO Guozhong WANG Qiao YANG Jian XIA Shibin ZHANG Wei LI Hu GAO Hui |
| |
| Institution: | Chengdu Center of China Geological Survey, Chengdu,Sichuan 610081, China |
| |
| Abstract: | In recent years, with the major breakthrough in oil and gas exploration in the periphery of Sichuan basin, the Yanyuan- Ninglang area has become the key research area for oil and gas investigation of new strata in the new area. The Yanyuan- Ninglang area is located in the western margin of the Yangtze platform. Its complex fault system and frequent tectonic and magmatic activities restrict the generation, transportation and storage of oil and gas in this area. In view of the shallow depth that can be reached by the current oil and gas resources development, this paper first uses the deep structure of the Earth provided by the crash 1.0 library to obtain the regional gravity anomaly in the study area by using the frequency domain interface forward modeling method, and then subtracts the regional gravity anomaly from the surface Bouguer gravity anomaly to obtain the residual gravity anomaly excited by the upper crust. Based on the analysis of the distribution characteristics of regional residual gravity in the Yanyuan- Ninglang and its adjacent areas, they are divided into areas I, II, III and IV on the plane. In combination with the surface geological conditions, the basement fluctuation of zone IV, which is most conducive to the development of oil and gas resources, is inversed by Parker interface inversion, and further divided into 8 sub areas. Based on the comprehensive analysis of the basement fluctuation, gravity profile inversion and magnetotelluric sounding profile inversion in the 8 sub areas, it is considered that the area is a syncline structure in the west of the Kangdian ancient land and in the northeast direction. The anticline structure between the southeast wing of syncline and the Jinhe- Qinghe fault is a favorable exploration structure with good resource potential. |
| |
| Keywords: | gravity field Crust 1 0 magnetotelluric Yanyuan Ninglang |
|
| 点击此处可从《地质学报》浏览原始摘要信息 |
| 点击此处可从《地质学报》下载免费的PDF全文 |
|
