横山油田魏家楼区三叠系延长组长6~1储层特征研究

针对横山油田魏家楼区长61油层段,对其储层岩石学、储层物性、孔隙结构及储层控制因素等进行了研究。该层段储层岩石类型主要为细粒长石砂岩和岩屑长石砂岩,成分成熟度低,结构成熟度高;岩石物性总体较差,属低孔、低渗储层,发育有粒间孔、粒间溶孔、粒内溶孔、铸模孔、晶间微孔和微裂缝等几种孔隙,其中又以次生粒间溶孔为主。喉道以细喉-微喉为主;沉积作用发生后,成岩作用控制着储层孔隙结构特征及储层物性。根据岩性和物性特征,该区储集岩分为3类:Ⅰ类为好储集层,Ⅱ类为较好储集层,Ⅲ类为差储集层。

Research on Triassic Chang 6~1 reservoir in Weijialou area of Hengshan oilfield

In the Hengshan oilfield Weijialou area Chang 61 oil layer, the reservoir petrology, physical properties, pore structure and reservoir controlling factors is studied. The layer of reservoir rock type is mainly fine-grained feldspar sandstone and lithic arkose, low compositional maturity, high textural maturity; overall petrophysical property is poorer. It is characterized by low porosity, low permeability reservoir with development of intergranular pores, intergranular dissolved pore, intragranular dissolved pore, mould pore, intergranular micropore and the micro crack pores, among which it is mainly secondary intergranular dissolution pores. In the throat channel, it mainly developed fine throat - micro laryngeal. After sedimentation occurs, the diagenesis controlled reservoir pore structure and reservoir physical property. Based on the lithology and physical property, the reservoirs are divided into 3 categories:Class Ⅰ is good reservoir, class Ⅱ for better reservoir, and Class Ⅲ poor reservoir.