碳酸盐岩储层酸蚀前后矿物成分分析

Analysis of Mineral Composition of Carbonate Reservoir Before and After Acid Erosion

米桑油田是伊拉克南部石油经济的重要支柱,但由于储层在纵向上物性变化幅度较大,储层内部非均质性较强,因此需要采取酸化酸压措施以进一步提高油田的开发效果。为提高酸化酸压产能预测的准确性,利用X射线衍射分析的技术手段,对米桑油田碳酸盐岩储层的微观特征进行系统性认识,深度分析各实验岩心在不同溶蚀时间的条件下,岩心中矿物成分的变化情况,得到不同岩心酸蚀后方解石及白云石的溶解情况不同的实验结论。研究结果为后续的产能预测模型的参数选取及输入提供依据,对提高酸化酸压措施产能预测的准确性具有一定的指导意义。

The Maysan oil field is an important pillar of the oil economy in southern Iraq.However,due to the large vertical changes in physical properties of the reservoir and the strong internal heterogeneity of the reservoir,acid fracturing measures need to be taken to further improve the development of the oil field in order to improve the accuracy of acidification and acid fracturing productivity prediction,the technical means of X-ray diffraction analysis is used to systematically understand the microscopic characteristics of the carbonate reservoirs in the Missan Oilfield,and deeply analyzes the different experimental cores.Under the condition of dissolution time,the change of mineral composition in the core,the experimental conclusions of different dissolution of calcite and dolomite after different core acid corrosion have been obtained.The research results provide a basis for the parameter selection and input of the subsequent productivity prediction model,has certain guiding significance for improving the accuracy of production capacity prediction of acidification and acid fracturing measures.