赵春晨, 刘护创, 畅斌, 王宁. 鄂尔多斯盆地陕北斜坡储层岩石学特征及油气勘探指示——以油房庄北部长6油层组为例[J]. 地质与资源, 2024, 33(3): 331-338, 309. DOI: 10.13686/j.cnki.dzyzy.2024.03.008
    引用本文: 赵春晨, 刘护创, 畅斌, 王宁. 鄂尔多斯盆地陕北斜坡储层岩石学特征及油气勘探指示——以油房庄北部长6油层组为例[J]. 地质与资源, 2024, 33(3): 331-338, 309. DOI: 10.13686/j.cnki.dzyzy.2024.03.008
    ZHAO Chun-chen, LIU Hu-chuang, CHANG Bin, WANG Ning. PETROLOGICAL CHARACTERISTICS AND OIL-GAS EXPLORATION INDICATION OF THE RESERVOIRS ON NORTHERN SHAANXI SLOPE IN ORDOS BASIN: A Case Study of Chang 6 Oil Reservoir in Northern Youfangzhuang Area[J]. Geology and Resources, 2024, 33(3): 331-338, 309. DOI: 10.13686/j.cnki.dzyzy.2024.03.008
    Citation: ZHAO Chun-chen, LIU Hu-chuang, CHANG Bin, WANG Ning. PETROLOGICAL CHARACTERISTICS AND OIL-GAS EXPLORATION INDICATION OF THE RESERVOIRS ON NORTHERN SHAANXI SLOPE IN ORDOS BASIN: A Case Study of Chang 6 Oil Reservoir in Northern Youfangzhuang Area[J]. Geology and Resources, 2024, 33(3): 331-338, 309. DOI: 10.13686/j.cnki.dzyzy.2024.03.008

    鄂尔多斯盆地陕北斜坡储层岩石学特征及油气勘探指示——以油房庄北部长6油层组为例

    PETROLOGICAL CHARACTERISTICS AND OIL-GAS EXPLORATION INDICATION OF THE RESERVOIRS ON NORTHERN SHAANXI SLOPE IN ORDOS BASIN: A Case Study of Chang 6 Oil Reservoir in Northern Youfangzhuang Area

    • 摘要: 为明确鄂尔多斯盆地油房庄北部有利相带和优质储层发育区,推进鄂尔多斯盆地探明储量的进一步扩大,通过岩心薄片观察、岩石矿物成分分析测定等多种手段开展油房庄北部重点层段长6油层组储层的碎屑颗粒组成、填隙物组分等关键特征要素研究,并在此基础上分析长6油层组储层的重、轻矿物分布规律,进而探讨物源的指示意义以及油气耦合关系,以期补充该地区关于储层岩石学和物源分析的科研成果. 经分析,长6砂岩储层主要为长石砂岩,并见少量岩屑长石砂岩; 填隙物的类型多、含量变化大,主要包括黏土胶结物、碳酸盐类胶结物、硅质胶结物等; 粒级分布以细砂为主,颗粒磨圆为次棱角状,颗粒分选中等以上占主体; 胶结类型以薄膜-孔隙型和孔隙-薄膜型、孔隙型、薄膜型、加大-孔隙型胶结为主. 长6砂岩储层标准偏差对粒度平均值图解和重矿物组合、轻矿物组分都揭示了长6油层组时期研究区主要受东北方向物源影响,发育了多期叠置的三角洲前缘水下分流河道砂体,并且由于长距离搬运效应,残余粒间孔、长石溶孔较为发育,长石、绿泥石和高岭石的矿物组合在一定程度上提升了研究区的储层物性,并增加了低阻油藏的渗透性. 长61和长62的水下分流河道砂体为研究区的优质储层发育区.

       

      Abstract: To identify favorable facies belt and high quality reservoir development area in northern Youfangzhuang area and expand the proved reserves in Ordos Basin, the paper studies the clastic particle composition and interstitial component of Chang 6 oil formation reservoir through various experimental means such as core thin section observation and mineral composition analysis with detailed experimental data. On this basis, the distribution rule of heavy and light minerals in Chang 6 reservoir is analyzed, and the indication significance of provenance and oil-gas coupling relation are discussed to supplement the scientific research results of reservoir petrology and provenance analysis in the area. The results show that Chang 6 sandstone reservoir is mainly feldspar sandstone, with minor lithic arkose. The interstitial materials are various in types and contents, including clay cement, carbonate cement and siliceous cement. The grains are mainly fine sand, sub-angular and above middle-level sorted. The cementation types are mainly film-pore, pore-film, pore, film and overgrowth-pore cementation. The standard deviation vs. average grain size diagram, heavy mineral association and light mineral composition of Chang 6 sandstone reservoir all indicate that the Chang 6 oil formation is mainly affected by the provenance from northeast, therefore the multi-stage superimposed delta front underwater distributary channel sand bodies are developed. Besides, the residual intergranular pores and feldspar dissolution pores are developed due to long distance transport. The mineral assemblage of feldspar, chlorite and kaolinite improves the physical properties of reservoir in the study area and increases the permeability of low resistivity reservoir. The underwater distributary channel reservoirs in Chang 61 and 62 oil formations are high quality reservoir development areas.

       

    /

    返回文章
    返回