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四川盆地龙岗和罗家寨-普光地区都发现了二、三叠系礁、滩体天然气藏,但气藏规模、丰度与分布差异较大.二者既有共性,更有差异.共性是:(1)礁、滩储集体岩性、物性及储集空间类型基本一致;(2)都具有良好的盖层条件,流体系统封闭性较好;(3)都存在液态烃早期充注、后期热裂解生气与抬升阶段气藏调整、晚期定型.差异性是:(1)罗家寨-普光地区以油型裂解气为主,多源供给,气源充足;龙岗地区以煤型气为主,气源充分性较差;(2)龙岗地区储层非均质性更强,横向变化较大;(3)罗家寨-普光地区深大断裂发育,“源-储-输”匹配较好,龙岗地区断层较少,裂缝输导为主,横向变化较大.上述差异导致罗家寨-普光地区发育高丰度构造型气藏,规模与整装性较好,龙岗地区岩性控制更明显,丰度、规模与整装性较差.指出下一步针对礁、滩体气藏的研究应该向川东北、川西北九龙山等地区拓展,应特别加大对龙岗与开江-梁平海过渡区新层系的研究和探索,努力获得新发现.
The second and third Triassic reefs and tundra natural gas pools are found in Longgang and Luojiazhai-Puguang areas of Sichuan Basin, but the differences in scale, abundance and distribution of the gas reservoirs are large, both of which are common and even more different. : (1) The lithology, physical properties and reservoir space types of the reef and shoal reservoirs are basically the same; (2) both have good capping conditions and the fluid system is well closed; (3) In the later stage of pyrolyzation, the gas reservoirs were adjusted and advanced in the uplift stage.The differences were as follows: (1) The oil-based pyrolysis gas in Luojiazhai-Puguang area was dominated by multi-source and gas source was abundant; Main and poor gas source adequacy; (2) the reservoir heterogeneity in Longgang area is stronger and lateral variation is larger; (3) the deep faults in Luojiazhai-Pugu area develop, and the “source-reservoir- ”The matching is good, the faults in Longgang area are less, the cracks are mainly conducted and the lateral changes are larger, and the above differences lead to the development of high-abundance structural gas reservoirs in Luojiazhai-Pugu area with good scale and integrity. Longgang Lithology control is more obvious, abundance, scale and integrity is poor.It is pointed out that the next research on reef and shoal gas reservoirs should be to the northeast Sichuan, northwestern Sichuan Kowloon And other areas to expand, should be particularly open and increase the Longgang River - research and explore new strata Liangping transition zone, efforts to obtain new discoveries.