珠江口盆地白云-荔湾深水区幔源CO2充注的黏土矿物成岩响应 |
| |
引用本文: | 刘妍鷨,陈红汉,王艳飞,韩晋阳,李倩.珠江口盆地白云-荔湾深水区幔源CO2充注的黏土矿物成岩响应[J].地质科技通报,2021,40(3):85-95. |
| |
作者姓名: | 刘妍鷨 陈红汉 王艳飞 韩晋阳 李倩 |
| |
摘 要: | 珠江口盆地白云-荔湾深水区油气勘探中钻遇大量高含量CO2气层,使得如何规避高CO2风险成为当前面临的挑战。通过工区充注CO2的储层砂岩黏土矿物X射线衍射(XRD)、流体包裹体显微测温和稀有气体同位素组成等分析,明确了幔源无机CO2的成因,并运用黏土矿物特征讨论高温幔源无机CO2充注的黏土矿物成岩响应:有序带倒转和大量自生高岭石的生成。依据CO2气井的XRD全定量分析数据剖面图将幔源无机CO2气层段的黏土矿物组合分为3类:Ⅰ类为I/S混层黏土矿物中S体积分数介于10%~25%之间,有序度处于R2~R3带,高岭石体积分数高;Ⅱ类为I/S混层黏土矿物中S体积分数介于10%~15%,有序度为R2~R3带,自生高岭石体积分数低;Ⅲ类为I/S混层黏土矿物中S体积分数介于50%~60%,有序度为R0带,高岭石体积分数低。总结出幔源CO2在珠江组和珠海组中存在2种运聚模式:一是幔源CO2通过与基性岩浆连通的深大断裂垂直向上运聚;二是垂直向上运移后通过连通砂体侧向长距离运聚。研究结果对珠江口盆地白云-荔湾深水区下一步油气勘探规避高含量CO2风险具有指导作用。
|
关 键 词: | 幔源CO2 黏土矿物 成岩响应 深水区 珠江口盆地 |
收稿时间: | 2020-09-24 |
Diagenetic effect of mantle-derived CO2 charge to clay minerals in the Baiyun-Liwan deepwater area of the Pearl River Mouth Basin in South China Sea |
| |
Abstract: | During petroleum exploration in the Baiyun-Liwan deep-water area of the Pearl River Mouth Basin (PRMB), South China Sea, a huge number of CO2 gas reservoirs has been met. Therefore, how to avoid the high CO2 risk has become a big challenge now. In this paper, the X-Ray diffraction (XRD) of clay minerals in the sandstone filled with CO2, microthermometry of fluid inclusions and isotopes of noble gas were used for analysis. The results show that the origin of inorganic CO2 is magmatic. The effects of mantle-derived CO2 on clay minerals are the inversion of clay mineral order degree and the formation of a largeamount of authigenic kaolinite. Moreover, the clay mineral assemblage was divided into three types based on the of XRD analysis data in CO2 wells. Finally, two patterns of CO2 migration and accumulation in the Zhujiang and Zhuhai Formations were summarized: (1) the mantle-derived CO2 migrates vertically upward through the deep faults which connected with the mafic igneous rocks, and (2) lateral long-distance migration through connecting sand bodies after vertical upward migration. These results have certain guiding significance for avoiding the risk of high CO2 in the future exploration in the deep-water area of PRMB, South China Sea. |
| |
Keywords: | |
|
| 点击此处可从《地质科技通报》浏览原始摘要信息 |
| 点击此处可从《地质科技通报》下载免费的PDF全文 |
|