王庄油田郑408砂砾岩体储集层非均质性及敏感性研究
|
摘要
王庄油田位于东营凹陷北部陡坡带西段 ,沙三上亚段油藏为受边、底水影响的地层 岩性油藏 ,主体部分是郑 40 8砂砾岩体。该砂砾岩体虽具有中高孔、中高渗储集层特点 ,但存在较严重的非均质性和敏感性问题 ,平面以北部非均质性最强 ,纵向以上部非均质性更严重。以沉积学标志为基础 ,结合测井相及地震相等方法 ,分析认为郑 40 8砂砾岩体为近源快速堆积的扇三角洲相砂砾岩体 ,成分成熟度和结构成熟度都低 ,成岩作用弱 ,以原生孔隙为主。对油田主力区 5口取心井 65块 (次 )沙三上亚段岩心进行流动实验和辅助实验 ,结果是储集层胶结疏松 ,黏土矿物主要是不稳定的伊 /蒙混层矿物 ,敏感性损害主要是中—强水敏性 ,其次是中—弱酸敏性和碱敏性。因此 ,王庄油田注水开发时 ,要着重加强防水敏工作。图 2参 2 (王孝陵摘 )
Wangzhuang oil field is located at the west section of the northern steep slope in Dongying sag. Upper S 3 submember in this oil field is a stratigraphic-lithological oil reservoir affected by edge-bottom water and its main part is conglomeratic Zheng-408 sand body. This conglomeratic sand body has the characteristics of medium-high permeability, medium-high porosity, fairly serious heterogeneity and sensitivity. The lateral strong heterogeneity is in the northern part and the vertical one is in the upper part. With the sedimentary index as a basis, combined with seismic phases and well logging phases, an analysis has recognized that conglomeratic Zheng-408 sand body is a near-origin, faster deposited, fan-delta facies conglomeratic sand bodies, with later low maturation in both composition of structure and weak diagenesis. Porosity is mainly composed of intergranular pores. Flow test and assistant test of 65 core samples from Upper S 3 submember in 5 wells in the main part of this oil field show that the reservoir beds are loosely cemented and argillaceous minerals are mainly unstable illite-montmorillonite mixtures. Sensitivity damage is mainly due to medium-high water sensitivity and medium-weak acid sensitivity, and alkaline sensitivity comes to the next. Therefore, in the development of this field by water injection anti-water sensitivity measures should be stressed.
Wangzhuang oil field is located at the west section of the northern steep slope in Dongying sag. Upper S 3 submember in this oil field is a stratigraphic-lithological oil reservoir affected by edge-bottom water and its main part is conglomeratic Zheng-408 sand body. This conglomeratic sand body has the characteristics of medium-high permeability, medium-high porosity, fairly serious heterogeneity and sensitivity. The lateral strong heterogeneity is in the northern part and the vertical one is in the upper part. With the sedimentary index as a basis, combined with seismic phases and well logging phases, an analysis has recognized that conglomeratic Zheng-408 sand body is a near-origin, faster deposited, fan-delta facies conglomeratic sand bodies, with later low maturation in both composition of structure and weak diagenesis. Porosity is mainly composed of intergranular pores. Flow test and assistant test of 65 core samples from Upper S 3 submember in 5 wells in the main part of this oil field show that the reservoir beds are loosely cemented and argillaceous minerals are mainly unstable illite-montmorillonite mixtures. Sensitivity damage is mainly due to medium-high water sensitivity and medium-weak acid sensitivity, and alkaline sensitivity comes to the next. Therefore, in the development of this field by water injection anti-water sensitivity measures should be stressed.
引文
1 胜利油田石油地质志编写组 (编 ) .中国石油地质志·卷 6·胜利油田 .北京 :石油工业出版社 ,1 993 .
2 裘亦楠等 .油气储层评价技术 .北京 :石油工业出版社 ,1 997.
2 裘亦楠等 .油气储层评价技术 .北京 :石油工业出版社 ,1 997.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心