摘要
常规薄片和扫描电镜分析表明,百色盆地上法地区兰木组石灰岩古岩溶储层具低孔渗特点,主要储集空间为后期改造产生的裂缝和溶蚀孔洞;经历了风化壳岩溶和缝洞渗流岩溶两种成因的两期岩溶作用,纵向上分表生岩溶带、渗流岩溶带和潜流岩溶带三个相带。裂缝以构造裂缝为主,以发育开启—半开启的高角度裂缝为主,低角度裂缝次之。有三种储层类型,其中以裂缝—孔洞型的最好,为主力产层,裂缝—孔隙型的次之,孔隙型的最差。影响古岩溶储层空间发育的主控因素为断裂和构造活动、岩石纯度、后期成岩作用的破坏。
By means of traditional thin sections and scanning electron microscope, the analysis result of Middle Triassic Lanmu limestone samples from Shangfa area in Baise Basin has shown that matrix of the paleokarst reservoir rock is characterized by low porosity and low permeability. Storage space of the rock commonly is late-reformed dissolved pores,caves and fractures. The paleokarst reservoir has suffered two periods of karstifications,weathering crust karstification and vedose karstificartion of fissure-cavity system, and three karst zones are classified in vertical. Structural fractures are common, among which unlocked and half-unlocked high-angle fractures are major and low-angle fractures are minor. The type of reservoir with Fractures and cavities is good for hydrocarbon accumulation, which is also the main pay. The one with fractures and pores is subordinate. The one with only pores is poor. It is included that the dominant geological factors controlling development of paleokarst spaces are： （1） fractures or tectonic movements; （2） the purity of rock itself; and （3） destruction of subsequent diagenesis.
出处
《海相油气地质》
2006年第1期15-20,共6页
Marine Origin Petroleum Geology
关键词
中三叠世
兰木组
碳酸盐岩
古岩溶储层
储层特征
百色盆地
Middle Triassic
Lanmu Formation
Carbonate rock
Paleokarst reservoir
Reservoir characteristics
Baise basin
