准噶尔盆地车排子北部地区沙湾组碳酸盐胶结物差异性分布控制因素
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本文为中国石油大学(北京)克拉玛依校区科研启动基金项目(编号:XQZX20200011、XQZX20180030)和新疆维吾尔自治区高校科研计划青年教师科研启动基金项目(编号:XJEDU2018Y059)的成果


Differential distribution control factors of carbonate cement from the Neogene Shawan Formation in northern Chepaizi area,Junggar Basin
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    摘要:

    通过铸体薄片、AxioVision图像分析、岩芯常规分析、地层水测试等方法,在明确了碳酸盐胶结物类型的基础上,采用多方法进行了碳酸盐胶结物含量的测定,探讨了准噶尔盆地车排子地区北部沙湾组碳酸盐胶结物差异性分布控制因素,并揭示了其对储层物性、油水分布的影响。研究表明,车北地区沙湾组储层中发育大量的早期碳酸盐胶结物,不均匀充填部分原生粒间孔,具有强烈的非均质性;在岩芯常规测定碳酸盐胶结物含量的基础上,利用多次数、多视域的AxioVision图像分析补充测定了碳酸盐胶结物含量,与岩芯常规测定结果对比相对误差-0.14,弥补了数据点的不足。碳酸盐胶结物含量平面上具有“北高南低”的差异性分布特征,胶结物形成于封闭性好、水体交替停滞的还原环境中,地层水Ca2+含量的差异决定了碳酸盐胶结物分布的差异,而地层水Ca2+含量的差异主要受古地貌控制,古高地水体较浅易富集Ca2+是CaCO3沉淀的良好场所,沉积微相在局部井区起到一定的控制作用。碳酸盐胶结物差异性导致研究区储层物性具有“双峰值”特征,并造成了高黏超稠油油藏复杂的油水分布关系。

    Abstract:

    Through thin section,AxioVision image analysis,conventional core analysis,formation water testing and other methods,on the basis of clarifying the types of carbonate cements,multiple methods were used to calculate the content of carbonate cements,we were discussed the controlling factors for the different distribution of carbonate cement in the northern Chepaizi area of Junggar Basin (NCPZ area),and revealed its influence on the physical properties and oil—water distribution.Methods:Core samples were measured by gas porosity tester,gas permeability tester and carbonate content in rock tester,respectively.The detection environment temperature was 20 ℃ and humidity was 60%.The slices are dyed with alizarin red solution,and the carbonate cements is determined by using the AxioVision image analysis software of Zeiss Company.The main method is to use the image analysis multiplication method to mark the image points of carbonate cements through multiple scans,calculate the distribution content of carbonate cements in different visual fields of the image,and then calculate the content of carbonate cements in the sample points by numerical average.And at the same time,the casting thin sections were used to carry out the reservoir space analysis.The salinity,ion content and water type of formation water samples had been tested in Shengli oil field Company of Sinopec.The detection basis is oil and gas field water analysis method SY/t5523- 2006.Results: Research shows that a large number of early carbonate cements developed in the reservoirs of the study area,and filling part of the primary intergranular pores unevenly,showing strong heterogeneity.On the basis of convent calculate of carbonate cement in core,AxioVision image analysis with multiple times and multiple fields of view was used to supplement the calculation of carbonate cement content,and the relative error compared with the core measurement result was -0.14,which effectively compensated for the lack of core measurement data points.The content of carbonate cements has a different distribution characteristic of “high in the north and low in the south”on the plane.Carbonate cement is formed in a reducing environment with good sealing and alternating stagnation of water bodies,and directly precipitates in the pore water of sediments.There is a good positive correlation between the Ca2+ content of formation water and the content of carbonate cement.The difference Ca2+ determines the difference in the distribution of carbonate cement,and the difference Ca2+ is mainly controlled by paleomorphology.The water body in the palaeotectonic plateau is shallow and easy to accumulate Ca2+,and it’s a good place for CaCO3 precipitation.Microfacies play a certain control role in local well areas.Conclusions:The difference in carbonate cements results in the “double peak” characteristics of the reservoir properties in the study area,and creates a complex oil—water distribution relationship in high-viscosity and super-heavy oil reservoirs.

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赵晓东,杨少春,鞠小玉,陈刚强,许涛.2021.准噶尔盆地车排子北部地区沙湾组碳酸盐胶结物差异性分布控制因素[J].地质论评,67(2):67030014,[DOI].
ZHAO Xiaodong, YANG Shaochun, JU Xiaoyu, CHEN Gangqiang, XU Tao.2021. Differential distribution control factors of carbonate cement from the Neogene Shawan Formation in northern Chepaizi area, Junggar Basin[J]. Geological Review,67(2):67030014.

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  • 收稿日期:2020-11-11
  • 最后修改日期:2021-02-01
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  • 在线发布日期: 2021-03-20
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