三塘湖盆地致密油烃源岩测井评价方法研究

发布时间：2018-11-13 13:15

【摘要】：三塘湖盆地位于准噶尔大型含油气盆地边缘,上二叠统芦草沟组地层有机质丰度高,生烃潜力大,是优质烃源岩的有利发育部位。芦草沟组地层岩性复杂、储集性能变化大,陆相、海相双重沉积特征并存,给油气勘探带来了较大的难度。本文针对三塘湖盆地致密油烃源岩,以测井资料为主要手段,研究芦草沟组、条湖组地层的烃源岩特征及其差异,进行烃源岩的定性识别与定量计算,结合有效烃源岩的分布,探索了芦草沟组和条湖组地层之间的源储配置关系。芦草沟组地层在牛圈湖构造带和马中构造带岩性差异大、且成分复杂、岩性变化大。对岩石物理及地球化学实验资料研究显示,芦草沟组烃源岩品质佳,其中牛圈湖构造带优势烃源岩为白云岩和泥岩,马中构造带为沉凝灰岩。相对而言相,条湖组烃源岩品质较差,烃源岩岩性较为单纯,以泥岩和凝灰岩为主。与非烃源岩相比,烃源岩具有较高的声波时差、中子孔隙度和电阻率,而密度较小。本文基于上述测井资料,分别采用判别函数法、交会图法和△LgR法可以将烃源岩较好识别。采用声波时差和电阻率测井资料,分别针对不同层组、不同构造带,建立了基于改进的△LgR的TOC(有机质含量)计算方法和利用电阻率、三孔隙度多信息融合的TOC计算方法,取得了较好的应用效果。利用吸附烃含量(S_1)与TOC建立有效烃源岩的判定标准和下限,确定了芦草沟组有利的烃源岩发育带主要在二段。同时,以实际生产资料为基础,综合分析地质地震资料,根据油源对比的分析结果,得到了条湖组油层主要来源于芦草沟组优质烃源岩,以断层为运移通道的源储配置关系。
[Abstract]:Santanghu basin is located at the margin of Junggar large hydrocarbon bearing basin. The upper Permian Lucaogou formation has a high abundance of organic matter and great hydrocarbon generation potential. It is a favorable position for the development of high quality source rocks. The lithology of Luchaogou formation is complicated, the reservoir performance changes greatly, and the dual sedimentary characteristics of continental and marine facies coexist, which brings great difficulty to oil and gas exploration. Based on logging data, the characteristics and differences of source rocks in Lucaogou formation and Tianhu formation are studied in this paper. The source rocks are qualitatively identified and quantitatively calculated, combined with the distribution of effective source rocks. The relationship between source reservoir allocation of Lucaogou formation and Tianhu formation is explored. The lithology of Lucaogou formation in Niuquan Lake structural belt and Mazhong tectonic zone is very different, and its composition is complex, and its lithology changes greatly. The physical and geochemical experimental data show that the source rocks of the Lucaogou formation are of good quality, and the dominant source rocks in the Niuquan Lake structural belt are dolomite and mudstone, and the mazhong structural belt is sedimentary tuff. Comparatively speaking, the source rocks of Tianhu formation are of poor quality and simple lithology, mainly mudstone and tuff. Compared with the non-source rocks, the source rocks have higher acoustic moveout, neutron porosity and resistivity, but lower density. Based on the above logging data, the discriminant function method, cross plot method and LgR method can be used to identify the source rocks. Based on the sonic time difference and resistivity logging data, the TOC (organic matter content) calculation method based on the improved LgR and the TOC calculation method based on the information fusion of resistivity and three porosity are established for different layers and different structural zones, respectively. Good results have been obtained. The criterion and lower limit of effective source rock were established by using S- 1 and TOC. The favorable source rock development zone of Luchaogou formation is mainly in the second member. At the same time, based on the actual data of production and comprehensive analysis of geological and seismic data, according to the analysis results of oil source correlation, it is obtained that the reservoir of Tianhu formation mainly comes from the high quality source rock of the Lucaogou formation, and the relationship of source storage and configuration of the fault as the migration channel is obtained.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.81

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