辽河断陷曙光古潜山古生代储层储集空间特征及演化

辽河断陷曙光古潜山储层的岩石类型主要为碳酸盐岩和砂岩;储集空间主要是次生成因的,包括孔洞和缝隙。古潜山中、高潜山带具有"上缝下孔"的特征,即上部以构造裂缝为主,溶蚀孔隙不发育;下部在裂缝发育的基础上,出现大量溶蚀孔、洞。低潜山带也存在裂缝和次生孔隙发育带,但深度大于中、高潜山带。潜山储层的这种分布与下列因素有关:(1)晚古生代和中生代的地壳抬升、走滑挤压造山和风化剥蚀产生大量溶洞、溶孔和裂缝;(2)新生代以来的走滑伸展作用使曙光古潜山储层逐渐埋到地下,产生一定的新裂缝;(3)上覆地层的持续沉积埋藏成岩作用使潜山已有孔缝得到再分配和改造。

Reservoir space characteristics and evolution of the Palaeozoic reservoir rocks in Shuguang buried hills,Liaohe fault basin

The reservoir rocks in Shuguang buried hills, Liaohe fault depression are mainly composed of both sandstone and carbonate rocks. A large proportion of reservoir space is secondary, including vugs and fractures. In Shuguang buried hills the medium-high buried hills are characterized by the so-called "fracture development in upper part but vug development in lower part", that is, the tectonic fractures are common in the upper part of buried hills without so-lutional voids, whereas the large numbers of solutional voids most likely to occur in the lower part of buried hills. The development belt of fracture and secondary pores is also present in gentle buried hills, but its buried depth is deeper than that in medium-high buried hills. The distribution of reservoir rocks in buried hill is related to the following factors : (1) a vast amount of solution vug and fracture formed by crust uplift, compressional strike-slip orogenesis, weathering and denudation during the late Paleozoic-Mesozoic era; (2)new fissures formed by the progressively deep burial of reservoir rocks in Shuguang buried hills during the Cenozoic strike-slip extension; (3)redistribution and reworking of the existing pores and fissures in Shuguang buried hills due to the steady burial diagenesis of overlying strata.