摘要
本区天然气主要产自中新统煤系地层,具有西太平洋区域第三系成油气的共同特点,并有来自慢源、海相碳酸盐岩和有机物热解混合的碳酸气成分。气藏的形成与分布主要受岩性(砂体)、较完整的背斜和走滑断层所控制。下一步的勘探方向是:(1)西北部沿已知含油气背斜长轴方向上的构造高点;(2)深部木山组及其以下层位(包括白垩系);(3)扭性断层的上升盘或上盘构造圈闭;(4)基底高区及其周围的地层不整合和地层尖灭封闭。
The natural gas, produced mainly from Miocene coal measures in this region, shows as com- mon characteristic of coal-generated hydrocarbons in the west Pacific Ocean (i. e., east and south China sea, Indonesia, Malaysia) with some carbon dioxide gas derived from mantle source and mixed pyrolysis of marine carbonate rocks and organic matter.The formation and occurrence of gas reservoir are principally controlled by lithology (sand bodies), relatively complete anticlines and strike-slip faults. The orientation for further petroleum exploration would be as follows: (1) the northwest structural highs along the macroaxis direction of known oil-and gas bearing anticlines; (2) the deep-buried Mushan Formation and its underlying strata (including the Cretaceous); (3) the structural traps developed at the upthrown or up- per sides along torsion fault;(4) the basement highs and their surrounding unconformity and stratigraphic nip traps.
关键词
天然气
煤成烃
地质构造
油气勘探
Western Taiwan basin
Natural gas
Tertiary
Coal-generated oil
Sand bodies
Anticline
Strike slip faults
Unconformity
