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根据钻井、测井与分析测试资料,对塔里木盆地天山南地区古近系储层特征及其控制因素进行了研究。天山南地区古近系岩石类型以长石石英砂岩和岩屑长石砂岩为主,铁泥质、钙质和石膏等填隙物含量高,分选、磨圆中等,具有成分成熟度高、结构成熟度中等的特点。砂岩储层孔隙类型主要有粒间孔、粒间溶孔、粒内溶孔、微孔及裂缝等,其中以溶蚀孔隙为主,粒间孔次之。孔隙度主要为4.5%~17.5%,渗透率为0.1×10-3~10×10-3μm2,总体属于细孔喉的特低孔—特低渗透储层。影响研究区储层物性的主要因素有沉积相和成岩作用等,其中辫状河三角洲前缘的分流河道和席状砂储层物性好,是有利的油气储集相带,胶结作用和溶蚀作用是影响天山南地区古近系储层发育的最主要成岩作用。
Based on the data of drilling, well logging and analysis, the characteristics and controlling factors of Paleogene reservoirs in Tianshannan area of Tarim Basin were studied. The Paleogene rock types in the Tianshan area are mainly feldspar quartz sandstone and lithic feldspathic sandstone, with high content of interstitial materials such as iron mud, calcareous and gypsum, medium separation and medium rounding, with the features of high maturity, Moderate maturity of the structure characteristics. The pore types of sandstone reservoirs mainly include intergranular pores, intergranular dissolved pores, intragranular dissolved pores, micropores and fractures, among which the dissolved pores are the dominant ones, followed by the intergranular pores. The porosity is mainly from 4.5% to 17.5% and the permeability is from 0.1 × 10-3 to 10 × 10-3μm2. It belongs to the ultra-low porosity-ultra-low permeability reservoir of pore throats. Sedimentary facies and diagenesis are the main factors influencing the reservoir physical properties in the study area. The distributary channel and silt sand reservoir in the front of the braided river delta have good physical properties and are favorable oil and gas reservoir facies belt, cementation and dissolution It is the most important diagenesis that affects the development of Paleogene reservoirs in the southern Tianshan Mountains.