摘要
根据岩心观察、铸体薄片、扫描电镜及压汞曲线等分析,从孔隙类型、孔隙结构等方面对孝泉-新场地区上三叠统须家河组四段砂岩储层进行了深入的研究。研究区须家河组四段储层孔隙类型可分为原生残余粒间孔、次生粒间溶蚀孔、粒内溶孔、铸模孔、晶间孔和裂缝6种主要孔隙类型;研究区须四段砂岩中可见多种孔隙组合类型,主要有:残余原生粒间孔-溶孔型,晶间孔-溶孔型,其次还有少量的微孔、微裂缝型;孔隙结构可分为4种类型:Ⅰ类粗喉大孔型、Ⅱ类粗喉小孔型、Ⅲ类细喉大孔型以及Ⅳ类细喉小孔型等4种类型,其中Ⅰ类粗喉大孔型、Ⅱ类粗喉小孔型为较好类型储层孔隙结构,可以获得一定的工业产能。
The reservoirs in 4th member of Xujiahe Formation of upper Triassic in Xiaoquan-Xinchang area were comprehensively evaluated by pore types and pore structure,according to the observation of core, core slice, SEM and capillary pressure curve.The pore of reservoirs in T3x4 member can be subdivided into six types,residual intergranular pores,secondary intergranular dissolution pores,intragranular dissolved pores,moldic pores,intergranular pores and fissures.Several pore combinations were identified in the 4th member sandstone of Xujiahe Formation,mainly including：residual intergranular pores-dissolved pores type,intergranular pores-dissolved pores type,followed by a small amount of micro-pores,micro-fissures.Pore structure can be divided into four types,type Ⅰ - large throat with large pore,type Ⅱ - large throat with small pore,type Ⅲ- small throat with large pore,and type Ⅳ-small throat with small pore. Ⅰ and Ⅱ are the better types of the reservoir pore structure,which can access to certain industrial capacity.
出处
《中国西部科技》
2011年第33期28-30,共3页
Science and Technology of West China
