鄂尔多斯北部塔巴庙地区奥陶系风化壳储渗体特征及分布

在古岩溶作用、同生成岩作用下,鄂尔多斯北部塔巴庙地区马五5以上地层发育为典型的古岩溶储层.储层岩石特征及电性、物性特征表明研究区为低孔、低渗致密风化壳储层.根据测井地质及储层地质特征将该区储层划分为孔隙型、溶蚀孔(洞)型、裂缝型及裂缝-(溶)孔隙型.其中以孔隙型储渗体为主,溶蚀孔(洞)型及裂缝-(溶)孔隙型储渗体次之,裂缝型少量.查明并论述了风化壳储渗体在岩溶地貌与岩溶剖面中的分布与规模.储渗体的特征和分布将为确定有利的勘探目标提供可靠的依据.

Character and distribution about the reservoir and permeable body in Ordovician weathering crust in Tabmiao of north Ordos basin, China

A set of typical paleokarst reservoirs have developed in the area of Tabmiao because of the paleokarst action and syndiagenesis above Ma5 member. This paper analyzes the reservoir characteristic, palaeocrust, well logs, physical property of weathering crust and ascertains that this area belongs to a poor porosity and poor permeability weathering crust reservoir. According to well logs geology and reservoir geology, the reservoirs of this area can be classified into porosity type, dissolvable porosity type, fracture type, dissolvable porosity and fracture type. Porosity type is the main reservoir and permeable body, next is the dissolvable porosity type and dissolvable porosity and fracture type. However, the fracture type is comparatively bad. The reservoir and permeable weathering crust is ascertained and discussed to have relations with the distribution and size of the karst geomorphology and karst cross-section. And tile charaeterstic and distribution of the reservoir and permeable body will be supplied the reliable evidence to ensure the advantage exploration aims.