CAJ | 학술논문

在厘定其不同层次界面成因的基础上,把Miall研究思路成功移植到洪积扇相复杂储层中,建立了与开发精度相匹配的洪积扇储层内部结构研究的层次分析法,即复合水道、单期水道和高渗透段3个层次.划分出洪积扇砂砾岩储层5级构型界面:5级界面为洪泛沉积发育稳定的泥岩,构成油田开发中的隔层;4级界面由厚度变化的泥岩、粉砂质泥岩组成,形成流体渗流屏障;3级界面为形成的支撑砾岩体与周围储集体的岩性突变面.总结了复合水道规模扇缘亚相单期条带状、扇中亚相多期交织的宽带状及扇顶亚相多期垂向叠加的厚层板状砂砾岩体的分布特点.提出了洪积扇单期水道研究方法,即分别从单期水道4个方面的垂向识别特征和4种单期水道的侧向界面识别标志入手,在3种单期水道空间组合模式指导下开展三维空间组合研究.2个典型井区的实例分析表明,扇顶亚相单期水道的边界沿着古水流方向近似呈直线分布,多期水道呈楔形叠瓦状前积叠加,垂直物源方向为垂向加积切割叠置关系;扇中亚相单期水道边界类似曲率较小的辫状河道边界,多期水道具有侧向叠置的特点.
재전정기불동층차계면성인적기출상,파Miall연구사로성공이식도홍적선상복잡저층중,건립료여개발정도상필배적홍적선저층내부결구연구적층차분석법,즉복합수도、단기수도화고삼투단3개층차.화분출홍적선사력암저층5급구형계면:5급계면위홍범침적발육은정적니암,구성유전개발중적격층;4급계면유후도변화적니암、분사질니암조성,형성류체삼류병장;3급계면위형성적지탱력암체여주위저집체적암성돌변면.총결료복합수도규모선연아상단기조대상、선중아상다기교직적관대상급선정아상다기수향첩가적후층판상사력암체적분포특점.제출료홍적선단기수도연구방법,즉분별종단기수도4개방면적수향식별특정화4충단기수도적측향계면식별표지입수,재3충단기수도공간조합모식지도하개전삼유공간조합연구.2개전형정구적실례분석표명,선정아상단기수도적변계연착고수류방향근사정직선분포,다기수도정설형첩와상전적첩가,수직물원방향위수향가적절할첩치관계;선중아상단기수도변계유사곡솔교소적변상하도변계,다기수도구유측향첩치적특점.
Based on the study of different hierarchical bounding surfaces and the transplantation of the Miall's idea in the complex reservoir of alluvial fans, a hierarchy analysis method is established, which is suited for the development precision on the inner structure of the alluvial fans. This hierarchy consists of the large-scale glutenite multiplex channel, moderate scale single channel and the small scale high penetrative member. Then five level architectural boundary systems of glutenite of alluvial fan reservoir are set up. The bounding surfaces at Level Five and Level Four often act as fluid-flow barriers, while that at Level Three is a contact plane between two kinds of lithology. The distribution of the three planar model of multiplex glutenite is characterized by single-period banding of the subfacies on the fan margin, multi-period mingle broad banding of the intrafan subfacies and multi-period thick vertical superimposition tablet in the fanhead subfacies. Hence, a method of single-period channel is proposed for the study based on these characteristics. With this method the three dimensional assemblage is established with spatial pattern of the three kinds of single-period channel according to the four fields of vertical and latteral identification marks of each single period-channel. The analysis of two actual typical well blocks demonstrates that the single-period channel of the fanhead subfacies is distributed along the ancient water flow , approximately linear to the orientation of the sedimentary source, and that the multi-period channel is wedge-shaped imbricate superimposition, cutting and overlying on the vertical orientation of sedimentary source . While the intrafan subfacies present characteristics of muli-period channel sideway overlying on the vertical orientation of sedimentary source.