滑脱型潜山成藏研究--以沾化凹陷渤深6潜山为例

渤深6潜山于早第三纪初期与埕东凸起分离,沿边界断层滑脱至渤南洼陷,后期为第三系覆盖,是济阳坳陷中典型的滑脱型潜山.在多期构造运动及古岩溶作用下,潜山中以碳酸盐岩为主的下古生界形成良好的储集空间.渤南洼陷中沙三段烃源岩为潜山提供了充足的油源,潜山内幕发育的断层为油气的运移提供了良好的通道,从而在潜山顶部形成风化壳油藏,而在潜山内幕则形成层状油藏.该潜山油气藏具有埋藏深、破碎严重、含油层系多、单井产能高且不含水的特点.研究渤深6潜山的成藏机制对指导断陷盆地深层滑脱型潜山油气藏的勘探具有指导意义.

Oil Accumulation in Decollement Buried Hill:A Case of Bonan Deep-Well 6 Buried Hill in Zhanhua Depression

The Bonan deep-well 6 buried hill is a good example for decollement hill in the Jiyang Basin. This hill was separated from Chengdong hill and formed a detached fault block in the Bonan Sag in the Early Tertiary. The Lower Palaeozoic carbonates have good reservoirs composed of fissures and pores after strong secondary alteration as the result of multiple structural movement and dissolution. The Es_3 source rock in the Bonan Sag provided rich oil for the hill. Moreover, the faults and fissures were the migration path, thus formed oil reservoirs both in top weathering crust and internal layers. This kind of reservoir hill is characterized by deep buried, strong breaking-up, multiple oil-bearing layers and rich productivity of single well. The study of reservoir mechanism of the Bonan deep-well 6 buried hill has great significance for the exploration of decollement hills on the steep slope in deep faulted basin.