鄂尔多斯盆地堡子湾地区三叠系长4+5组储层特征及对产能的控制

Characteristics and productivity control of Chang 4 + 5 oil-bearing sandstone reservoir in Baoziwan area,Ordos Basin

应用分析化验手段对堡子湾地区长4+5组砂岩储层特征进行了综合研究,结果表明:该套储层为陆相湖泊三角洲沉积体,储层岩性主要为细粒长石砂岩和细粒岩屑长石砂岩,储集空间孔隙以残余粒间孔和长石溶孔为主;储层物性较差,属于典型的低孔超低渗透储层.综合沉积、砂体、成岩、孔隙结构、物性等参数,建立了适合该区的储层评价标准并对该区储层进行了综合评价,发现不同类型储层对油气产能具有很好的控制作用:一类储层区油层发育好,试油单井产能最高;二类储层区油层发育较好,试油单井产能较高;三类储层区油层不发育,无产能.

The characteristics Chang 4 + 5 oil-bearing sandstone reservoir in Baoziwan area,Ordos Basin is comprehensively studied by means of various analytical methods.It is shown that the Chang 4 + 5 sandstone reservoir is a set of continental lake delta depositional body,its lithology is mainly fine-grained feldspar sandstone and fine-grain of debris feldspar sandstone.The reservoir space is mainly residual intergrain pores and feldspar solution pore.The reservoir is of poor property,and belongs to typical low-porosity ultra-low permeability reservoir.The reservoir evaluation standard suitable to the reservoir is established and the comprehensive evaluation of the reservoir is carried out based on sedimentary type,sand-body lithology,diagenesis and pore structure.It is found that the productivity of the reservoirs is controlled by the classification of reservoirs.In the studied area,Ⅰtype reservoirs are developed well,which are of the highest single-well productivity,Ⅱtype reservoirs are also developed well,which are of highersingle-well productivity,and Ⅲ type reservoirs are not developed,which have no productivity.