中国南方中、古生界海相地层油气显示及其表达的油气藏改造信息

Oil-gas shows of the paleozoic-mesozoic marine strata in southern China and their carried reforming information of hydrocarbon reservoir

对中国南方地面及井下共464个沥青、油、气显示点的层位、产状、改造机制和改造时期统计分析认为:油气显示产状丰富,裂缝(断裂)占优,晶洞和孔隙次之,溶孔和溶洞最少.断裂作用是中国南方中、古生界海相原生油气藏最主要的改造机制,其次是隆升剥蚀作用.不同区块有不同的改造机制,中、下扬子区油气显示与张性正断层及其张节理密切相关,上扬子区为断裂和隆升剥蚀的联合作用.油气显示的原始改造期为燕山晚期—喜山早期,其次为喜山晚期.各构造区块原始油气藏的改造时期不同,中、下扬子区为燕山晚期—喜山早期,上扬子区为燕山晚期—喜山期,江南隆起具有分段性,北段从海西期就开始被改造,直至喜山早期,而中段和南段的改造时期为燕山晚期—喜山早期.

The oil-gas show characteristics show that there are many types of oil and gas reservoirs in paleozoic-mesozoic marine strata in southern China,and they distribute in wide area and many horizons.According to the statistical analysis of the horizon,the occurrence,reservoir reformation mechanism and reservoir reformation period of 464 show points of bitumen,oil and gas,it is held that there are many types of occurrence of oil-gas shows,and in the reservoirs,fracture is the richest,miarolitic cavity and pore are secondary,and dissolution pore and karst cave are the least.faulting is the most main reformation mechanism of the marine oil-gas reservoirs,and uplift and erosion is secondary.The reformation mechanism of the reservoirs in different areas is different:in middle and lower Yangtze regions,there is the close relation between the oil-gas shows and tensional normal faults and their tensional joints,and in upper Yangtze region,the reformation mechanism is the combined effect of faulting with uplift and erosion.The primary reformation periods of the original oil-gas show reservoirs in different regions is different,in middle and lower Yangtze regions,the primary reformation is in late Yanshanian-early Himalayan,and in upper Yangtze region,it is in late Yanshanian-Himalayan.The reformation period of Jiangnan Uplift is multi-section,the northern section is from Hercynian to Early Himalayan,and the middle and southern sections are in late Yanshanian-early Himalayan.