川中地区侏罗系大安寨段致密油储层综合评价

发布时间：2018-04-22 08:22

本文选题：侏罗系 + 孔隙结构　；参考：《科学技术与工程》2017年29期

【摘要】：综合根据野外地质剖面、薄片鉴定、X-衍射、场发射扫描电镜、储层物性、孔隙结构、脆性指数、有机碳含量(TOC)、生烃潜力(S1+S2)和岩石力学分析,确定了川中地区大安寨段有利储层为介壳灰岩和泥页岩为薄互层状岩石组合,大一三亚段为相对优质的储集体。其脆性矿物含量明显高于大一和大三亚段,有利于产生天然裂缝和储层后期的压裂改造。有机碳含量(TOC)平均值为1.2%,生烃潜力(S1+S2)为1.1 mg/g,具有较高的生油气潜力。通过岩石薄片和铸体薄片分析发现大安寨段致密油储层为孔隙-裂缝型储层。运用高压压汞资料、储层物性资料等多种技术分析大安寨段储层物性特征,结果表明大安寨段储层有低孔、低渗的特征。扫描电镜分析结果明确了储层微米-纳米级孔隙发育和分布规律。黏土矿物颗粒之间的粒间孔在大一三亚段上部最为发育,与有机质发育相关的有机质孔和晶间孔在大一三亚段上部连通性比较好。综合分析判断大一三亚段上部为川中地区大安寨段储层勘探开发潜力区。
[Abstract]:According to the field geological profile, thin section identification of X-diffraction, field emission scanning electron microscope, reservoir physical property, pore structure, brittle index, organic carbon content, hydrocarbon generation potential, S 1 S 2) and rock mechanics analysis, The favorable reservoirs of Da'anzhai formation in central Sichuan are composed of thin interbedded rock assemblages of meso-limestone and shale and relatively high quality reservoirs in the first and third sub-member of Sichuan. The content of brittle minerals is obviously higher than that of the first and third member, which is beneficial to the formation of natural fractures and the later fracturing of reservoirs. The average value of organic carbon content (TOC) is 1.2%, and the hydrocarbon generation potential (S1S2) is 1.1 mg / g, which has high hydrocarbon generation potential. It is found that the tight oil reservoir of Da'anzhai formation is a porosity-fracture reservoir through the analysis of thin rock and cast thin sections. The characteristics of reservoir physical properties of Da'anzhai member are analyzed by using high-pressure mercury injection data and reservoir physical property data. The results show that the reservoir of Da'anzhai section has the characteristics of low porosity and low permeability. The development and distribution of micrometer-nanoscale pores in reservoirs were confirmed by SEM analysis. The intergranular pores between clay mineral particles are most developed in the upper part of Da-San sub-member, and the organic and intergranular pores related to the development of organic matter are better connected in the upper part of Data-Sansub section. Comprehensive analysis shows that the upper part of the first Sanya section is the reservoir exploration and development potential area of Da'anzhai member in the central Sichuan area.
【作者单位】：西南石油大学油气藏地质及开发工程国家重点实验室;
【分类号】：P618.13

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