轮南地区石炭系砂泥岩段—下亚段S3层储层微观特征分析

RESERVOIR MICROSCOPIC CHARACTERISTIC ANALYSIS FOR S3 LAYER OF CARBONIFEROUS SAND MUDSTONE SECTION-DOWN SUB-SECTION IN LUNNAN'S AREA

从储层的岩性、孔隙类型及影响孔隙结构的因素等方面,对轮南地区石炭系砂泥岩段—下亚段S3层储层的孔隙结构特征进行了分析,揭示了该储层的微观特征,为轮南地区进一步油气勘探和开发提供了详细的理论依据。研究结果表明,该储层主要为长石石英岩屑质砂岩,结构成熟度低。孔隙类型以粒间孔、粒间溶孔为主,次为粒内溶孔、胶结物内溶孔、方解石及高岭石晶间微孔,发育少量粒缘缝、微裂缝。孔隙结构主要以大孔大喉型和中小孔细喉型为主。压实作用、岩石粒度及泥质含量是影响研究区储层孔隙结构的主要因素,而粒度大小、泥质含量受沉积相控制,因此需加强研究区沉积微相的研究。

By analyzing the pore structure characteristic of carboniferous sand and mudstone section-- down sub-- section S3 horizon in LUNNAN＇s area from the factors of lithology, pore types and the factors of affect pore structure ete of reservoir. revealed the microscopic feature of the reservoir, may be provid detailed theory criteria for further step oil and gas exploration and depletion in LUNNAN＇s area. research result demonstrate, the reservoir mainly are horsesteeth quarta lithic sand ,textural maturity low. pore types give priority to intergranule pore,interparticle dissolution pore,secondly inelud intra- granular and bond inside dissolution pore, intercrystalline micropore in and lithocolla,developed little grain boundary crack and microcrack, pore structure mainly as well as the type of large pore and throat and junior pore and thinly throat, it was the major factor that compaction ,rocky granularity and mud content influence pore structure of the reservoir in region of interest. whereas granule size and shaliness Control by sedimentary facies, therefore the research foe the sediment microfacies in the re- gion of interest necessaries strengthen.