华蓥山东麓石炭系气藏圈闭特征与深化勘探

TRAP CHARACTERISTICS AND FURTHER EXPLORATION OF CARBONIFEROUS GAS POOLS AT THE EASTERN FOOT OF HUAYINGSHAN MOUNTAIN

华蓥山东麓的石炭系勘探程度较高，已探１２个圈闭，获１０个气藏，仅邻北断圈闭产水和南端的环山圈闭因残厚太薄已失储层而未获气。北段石炭系残厚稳定区，气藏皆为构造圈闭，并与区域构造一致，以地垒背斜圈闭为主；南段石炭系残厚多变区，气藏圈闭复杂，除构造圈闭外，随残厚的变化并有地层－地垒背斜复合、地层－叠断复合、地层－断层复合和残丘圈闭等，在一定条件下并有溶蚀岩性圈闭或断层－溶蚀岩性圈闭。深化勘探对象，主要为断下逆遮、地层－断层复合、地层－地垒背斜复合、地垒背斜和溶蚀岩性等圈闭。

Abstract The exploration degree of Carboniferous system at the eastern foot of Huayingshan Mountain is higher. Twelve traps have been explored, and ten gas pools obtained. Only the traps at the northern sector of Lin produce water, and the circum mountain traps at the southern sector do not produce gases because of too thin residual thickness and the loss of reservoir. In the stable area of Carboniferous residual thickness at the northern sector, the gas pools are all tectonic traps which are dominated by host anticlinal traps and consistent with regional tectonics. In the changeable area of Carboniferous residual thickness at the southern sector, the gas pool traps are complex. Besides tectonic traps, strata host anticlinal compound, strata stacking fault compound, strata fault compound and unaka traps exist together with the change of residual thickness. Under certain conditions, solution lithologic traps or fault solution lithologic traps also occur. The targets of further exploration are mainly underfault overthrust, strata fault compound, strata host anticlinal compound, host anticlinal ane solution lithologic traps.