摘要
三水盆地是一个叠置在印支—燕山期广花复向斜基础之上的白垩纪—早第三纪断陷盆地 ,火山活动强烈 ,二氧化碳气分布广泛 ,靠近断裂和火山活动中心二氧化碳气的含量较高 ,向四周二氧化碳气含量逐渐降低 ,断裂构造、火山—岩浆活动、基岩隆起控制二氧化碳气成藏特征 ;构造活动控制二氧化碳气的释放与成藏期 ,多期构造活动导致多期岩浆侵入与喷发 ,同时产生多期供气与多期成藏过程 ;存在火山岩自生自储 (裂隙 )式 ,砂岩孔隙—裂隙式、碳酸盐岩溶洞—裂隙式三种成藏方式 ;前白垩系不整合面 (T4)上、下和断层附近是二氧化碳气聚集的有利部位 ,多期复合型圈闭和早期形成晚期未受破坏的圈闭是二氧化碳气聚集的有利场所 ;火山—岩浆活动带或活动带附近是二氧化碳排放的良好区带。
Sanshui Basin is a Cretaceous-Early Paleogene fault-depression basin, which basement is Guanghua Synclinorium formed in Indosinian-Yanshan Period. In the basin, violent volcanic activity occurred; carbon dioxide gas is widely distributed; and it content is relatively high near faults and in the center of volcanic activity and decreases gradually from the center to all sides. The characteristics of carbon dioxide gas reservoir formation are closely related to the faults, volcanic–magmatic activity and basement uplift. The releasing and accumulating period of carbon dioxide gas were controlled by tectonic activities. Multistage magmatic eruption and intrusion were caused by multistage tectonic activities, which resulted in multistage gas supply and multistage reservoir formation processes in the same time. Three reservoir formation modes, i.e. the self-generating and self-storing(fissure) mode of volcanic rocks, the pore-fissure mode of sandstones and the cave-fissure mode of carbonate rocks, have been found out. The top and bottom of pre-Cretaceous unconformity surface(T 4) and the vicinity of faults were the beneficial portions of carbon dioxide gas accumulation; the multistage combination traps and the early-formed and late-undamaged traps were the favorable places of the carbon dioxide gas′being accumulated; and the volcano-magma active belts and their vicinities were the fair zones of the carbon dioxide gas′being released.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2004年第2期36-39,5,共4页
Natural Gas Industry
关键词
三水盆地
二氧化碳气藏
成藏模式
成因
主控因素
Carbon dioxide gas reservoir, Volcanic–magmatic activity, Basement uplift, Main control factor, Reservoir formation mode, Sanshui Basin
