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三塘湖盆地二叠系为该区重要的油气勘查目的层段之一，其中火成岩特别是安山岩、玄武者及其过渡类型为主要的储集岩类，火成岩储层的储集空间主要为孔隙和裂缝，次为溶洞。孔隙类型较多，包括气孔、残余气孔、基质晶间孔、溶蚀孔、缝洞充填残余孔等，裂缝主要为构造缝，次为成岩裂缝和风化裂缝。该区火成岩储集空间曾经历过十分复杂的演化过程，主要有9个演化时期．从早至晚依次为原生孔隙形成期（气孔、收缩缝等）→岩浆期后热液矿物充填期→地表和近地表风比淋滤期→埋藏孔隙充填期→Ⅰ期构造裂缝形成期→溶洞发育期→溶洞充填期→Ⅱ期构造裂缝形成期→后期溶蚀充填期。根据储集物性及储集空间类型，可将本区二叠系人成岩储层分为3类，即Ⅰ类储层：岩石孔隙度10％～22％．渗透率大于10×10~－3μm~2，有的大于100×10~－3μm~2．属孔缝洞复合型储层及部分的孔缝性储层；Ⅱ类储层：孔隙度大干10％．渗透率为（1～10）×10~－3μm~2．属孔缝型储层和部分的裂缝型储层；Ⅲ类储层；孔隙度大于10％，渗透率小于1×10~-3μm~2，属孔隙型储层和部分裂缝型储层。控制本区火成岩储层发育的因素主要为火成岩相、构造破裂作用和溶解作用，另外，油气侵入对储集空间的保存亦十分重要。
The Permian in the Santanghu Basin is one of the important reservoir sections for oil and gas exploration in this area. The igneous rocks, especially andesite, basaltic and their transitional types are the major reservoir rocks. The reservoirs for igneous rocks are mainly composed of pores And cracks, times for the cave. There are many types of pores, including stomata, residual stomata, intergranular pores in the matrix, dissolved pores, residual pores in the stope filling, etc. The fractures are mainly structural fractures, secondly diagenetic fractures and weathering fractures. The area of igneous rock reservoir has undergone a very complex evolution process, there are nine evolutionary periods. From the earliest to the later, the formation of primary pores (pores, shrinkage cracks, etc.) → the filling of hydrothermal minerals after magmatic period → the leaching period of surface and near-surface winds → the filling period of buried pores → the formation phase of structural fracture Ⅰ → the cave Developmental period → karst filling → stage Ⅱ tectonic fracture formation → late filling period. According to the reservoir properties and the type of reservoir space, the Permian diagenetic reservoir in this area can be divided into three types, namely type I reservoirs: rock porosity of 10% to 22%. The permeability is more than 10 × 10 ~ -3μm ~ 2, and some is more than 100 × 10 ~ -3μm ~ 2. It belongs to the pore-fractured complex reservoir and part of the pore reservoir. Class II reservoir: the porosity is 10% larger. The permeability is (1 ~ 10) × 10 ~ -3μm ~ 2. Belongs to the pore-type reservoirs and part of the fractured reservoirs; Class Ⅲ reservoirs; the porosity is greater than 10% and the permeability is less than 1 × 10 -3 μm -2, which belongs to the pore type reservoirs and some fractured reservoirs. The factors that control the development of igneous reservoirs in this area are mainly igneous rock facies, tectonic rupture and dissolution. In addition, the invasion of oil and gas into reservoirs is also very important.