泌阳凹陷新庄油田油气运聚特征研究

泌阳凹陷新庄油田断裂发育,构造破碎,主要发育一系列断鼻、断块油藏及少数不整合油藏。从该区的油层分布特征来看,油层埋藏浅,隔层较薄,单井油层井段集中;含油层位多,油藏数目多但规模较小,主力油层不突出;油层分布受断层控制明显,单层含油面积小,但平面上能够叠合连片。从油气控制因素来看,一方面继承性的鼻状构造控制了油气聚集方向和富集程度,油气主要富集在鼻状构造背景上的弧形断层内侧和反向屋脊断块等正向圈闭中;另一方面,断层在油气的运聚过程中发挥了重要作用,断层在成藏过程中既起到运移通道作用,又对油气的聚集起到了封堵作用,油气藏含油范围和油气藏高度主要受断层封闭性的控制,油气分布规律受伸展构造所伴生的各种断块群构造型式的控制。

Study of characteristics of hydrocarbon migration and accumulation in Xinzhuang oilfield in Biyang depression

A series of fault - nose and fault - block pools and several unconformity pools occur in Xinzhuang oilfield where faults are well developed and structures are fragmented. In respect of reservoir distribution, this oilfield has the following characteristics. The burial depth of reservoirs is shallow, barrier beds are relatively thin and oil - bearing intervals in a single well are concentrated; the number of pools is large, while their sizes are relatively small and the major reservoirs are not predominant; the distribution of reservoirs are obviously controlled by faults, and reservoirs are overlapped to some extent though the oil - bearing area of single layer is relatively small. In respect of the control factors of hydrocarbons, on one hand, the inherited structural noses would have controlled the direction of accumulation and the degree of enrichment of hydrocarbons, with hydrocarbons mainly accumulated in the positive traps such as the inside of arcuate faults and the inverse ridge fault blocks in a nose structural setting. On the other hand, the faults would have played an important role in migration and accumulation of hydrocarbons, acting as both migration pathways and seals. The oil-bearing area and oil column were mainly controlled by the sealing capacity of faults. The distribution patterns of hydrocarbons were controlled by structural styles of various fault block groups accompanying extensional structures.