鄂尔多斯盆地志丹油区长6油层组低孔低渗储层地质特征及测井评价

发布时间：2018-05-10 10:39

本文选题：低孔低渗 + 物性　；参考：《西北大学》2017年硕士论文

【摘要】：志丹油区长6储层属于典型的低孔低渗储层,具有物性差、孔隙结构复杂、非均质性强等特点。通过岩心观察、常规薄片、扫描电镜、核磁共振等资料,综合分析了研究区沉积环境、储层地质特征、储层非均质性、成岩作用等,进而在岩心标定基础上,明确储层“四性”关系,确定测井相,建立储层物性、含油性测井解释模型。根据试油试产资料,确定有效储层物性下限,多种方法相互验证,确定储层物性最优的测井解释模型。通过上述工作开展,取得主要结论和认识如下:(1)确定了研究区长6沉积微相,其中长61为三角洲前缘亚相,微相主要为水下分流河道、分流间湾;长62、长63、长64主要为滨浅湖亚相,微相主要为滨浅湖泥、滩坝。(2)研究区长6储层岩石类型以灰白色、浅灰色—灰色细粒长石砂岩为主,成分成熟度低;孔隙类型以粒间孔和溶蚀孔为主,微孔和晶间孔次之,溶蚀孔以长石溶孔为主;储层经历了多种成岩作用,储层物性差,层内、层间及平面非均质性强。(3)储层“四性”关系表明,长6储层中存在高自然伽马砂岩;自然电位与声波时差曲线重叠图能定性反映储层物性好坏;双感应电阻率对储层含油性反映较好。(4)对比威利公式与AFF公式解释储层物性精确度得出,利用AFF公式能够更准确的求取研究区长6储层孔隙度。(5)研究区长6有效储层参数下限为:长61孔隙度7%,渗透率0.3×10-3μm2,饱和度下限为35%;长62、长63、长64孔隙度为5%,渗透率0.2×10-3μm2,饱和度下限为 35%。
[Abstract]:The Chang 6 reservoir in Zhidan oil area is a typical low porosity and low permeability reservoir, which has the characteristics of poor physical property, complex pore structure and strong heterogeneity. Through the observation of core, conventional thin film, scanning electron microscope, nuclear magnetic resonance and so on, the sedimentary environment, reservoir geological characteristics, reservoir heterogeneity and diagenesis are synthetically analyzed, and then the core calibration base is carried out. On the basis of this, the "four nature" relationship of the reservoir is defined, the logging facies, the reservoir physical property and the oil-bearing logging interpretation model are established. According to the test oil test data, the lower limit of the physical property of the effective reservoir is determined, and a variety of methods are used to verify each other, and the well log interpretation model is determined. The main conclusions and knowledge are obtained as follows: (1) the following work has been made. The study area 6 sedimentary microfacies, including long 61 delta front subfacies, microfacies mainly underwater distributary channel, distributary Bay, long 62, long 63, long 64 mainly for shallow lake subfacies, the microfacies are mainly shore shallow lake mud, beach bar. (2) the study area of Chang 6 reservoir rock type is gray white, gray and gray fine feldspar sandstone, the composition maturity is low; pore low; pore low; pore low; pore maturity; pore low; pore low; pore low; pore low; pore maturity; pore low; pore maturity low; pore low; pore low; pore maturity low; pore low; pore maturity low; pore low; pore maturity low; pore low; pore maturity The gap type is mainly intergranular pore and dissolution hole, micropore and intergranular pore, and dissolution pore mainly with feldspar dissolution pore. The reservoir experienced a variety of diagenesis, reservoir physical property is poor, interlayer, interlayer and plane heterogeneity strong. (3) the reservoir "four" relationship shows that there are high natural gamma sandstone in the long 6 reservoir, and the natural potential and sonic time difference curve overlap The map can qualitatively reflect the physical property of the reservoir, and the dual induction resistivity reflects well the oil-bearing property of the reservoir. (4) comparing the Wiley formula and the AFF formula to explain the physical property accuracy of the reservoir, the AFF formula can be used to obtain the porosity of the 6 reservoir in the study area more accurately. (5) the lower limit of the effective reservoir parameters of the study area 6 is 61 porosity 7% and the permeability 0.3 * 10- The limit of saturation is 3, M2 is 35%, length 62, length 63, length 64 porosity 5%, permeability 0.2 * 10-3 m2, and saturation lower limit 35%..

【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13;P631.81

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