泌阳凹陷油气成藏特征及勘探潜力分析

泌阳凹陷核桃园组烃源岩发育，有机质丰度高，成烃潜力大，主力烃源岩大部分已经成熟．形成了丰富的油气资源；而南部和北部扇三角洲体系大多数都伸入生油区内．形成纵向交互叠置的多套生储盖组合。油气输导体系主要由砂体和断裂系统构成。在砂体内部，由于孔隙结构分布差异导致形成油气优势运移通道；油气运移成藏从核一段沉积末期-廖庄组沉积期开始，延续到廖庄组沉积末期以后的抬升时期，而廖庄组沉积末期以后的抬升剥蚀期是主要的充注成藏时期。根据油气成藏特征，在泌阳凹陷划分出3种典型的成藏模式，分别为早期成藏晚期连续叠加成藏模式、早期成藏晚期断层调整成藏模式和早期运移、断层调整、晚期充注成藏模式；在油气成藏特征分析基础上，认为北部斜坡带和南部陡坡带仍有较大勘探潜力。

Features of Hydrocarbon Accumulation and Analysis on Exploration Potential in Biyang Depression

Source rocks are developed in Hetaoyuan Formation of Biyang Depression, where organic matter abundance is high, the potential of hydrocarbon genesis is high, most of the major source rocks are matured, rich hydrocarbon resources are formed. Both in the south and north, the fan delta systems are extended mostly into the oil source area, many sets of crossover and superposed assemblages of source, reservoir and cap rocks are formed vertically. The hydrocarbon transferring system are mainly composed of sandbodies and fault system, the differences between the pore structural distribution within the sandbodies result in an advantageous hydrocarbon migrating path. The hydrocarbon migration and accumulation start from the late period of Eh_1 deposition-the period of Liaozhuan Formation and extend to the elevating period after the late period of Liaozhuan Formation deposition, of which the elevated corrosion period is the main period of hydrocarbon accumulation. Based on the property of hydrocarbon accumulation, 3 typical hydrocarbon accumulation patterns are identified in Biyang Depression, such as the pattern of early reservoir-forming-late continuous superposed reservoir formation, the pattern of early reservoir forming-late fault adjusted reservoir forming and the pattern of early migration, fault adjustment, late pack and accumulation. On the basis of analyzing the characteristics of hydrocarbon accumulation , it is considered that there still exists greater exploration potential in the north slope and south steep slope.