济阳坳陷裂解气成藏分析及勘探方向

Cracking gas reservoir-forming analysis and exploration orientation in Jiyang depression.

济阳坳陷裂解气成因和分布规律复杂,为了指导天然气勘探,对裂解气的主控因素和成藏特征进行了综合分析。研究表明:多套烃源岩及其埋藏深度和温度是济阳坳陷裂解气形成的主要控制因素;晚期生气、晚期成藏、有利的构造发育史、多种类型的储盖组合、异常压力封存箱及多种类型的成藏模式是裂解气藏的成藏特点;生气中心及周缘广泛分布的岩性圈闭以及围绕生气中心在沙三段下亚段以下层位发育的古构造、构造-岩性圈闭是裂解气勘探的主要方向。

The cracking gas origin and distribution rule are complex in Jiyang depression. In order to guide natural gas exploration,the main controlling factors and reservoirforming characteristics of the cracking gas were comprehensively analyzed. Many sets of source rocks,their buried depth and temperature are the main controlling factors of cracking gas forming in Jiyang depression. Reservoir-forming characteristic of cracking gas are gas -generation and reservoir -forming in late period,advantageous structural growth history,the multiple types of reservoir-cap combination,sealing box for keeping abnormal pressure and diversified types of reservoir forming models; main exploration orientation are the lighology traps distributed widely in the gas-generating center and the margin, palaeostructural and structurallithological traps developed below the lower Sha-3 member around the gas-generating center.