摘要
针对四川盆地普光地区茅口组白云岩化程度认识不清,加之该区茅口组取心资料不足的问题,以薄片鉴定为基础,采用岩屑X射线荧光元素分析方法对该区茅口组白云岩化程度进行了研究。白云岩元素特征是Ca、Mg含量富集,尤其是Mg含量增大3倍以上,特征识别元素为Ca/Mg值;灰岩元素特征为Ca含量高,通常大于75%,而Mg含量低,特征识别元素为Ca、Mg。这为利用白云岩和灰岩的特征元素来识别白云岩化程度不同的岩石类型提供可行性。据此,结合单井薄片鉴定结论,统计不同岩石类型的元素值,采用Ca/Mg和Mg交会图板法,建立了识别标准,利用该标准对该地区钻井白云岩化程度进行识别取得了较好效果。
In view of the lack of knowledge of the degree of dolomitization and the lack of coring information in Maokou formation,Puguang area of Sichuan Basin,based on the identification of thin section,the degree of dolomitization in Maokou formation of the area was studied by the cuttings X-ray fluorescence element analysis method.The elements of the dolomite are characterized by Ca and Mg enrichment,especially the content of Mg increased more than 3 times,and the feature recognition element is Ca/Mg value.The limestone element is characterized by high content of Ca,usually greater than 75%,and the content of Mg is low,the feature recognition elements are Ca and Mg.This provides the feasibility for identifying the different rocks types with different dolomitization by using the characteristic elements of dolomite and limestone.Thus,combining with the conclusion of single well thin section identification,the element values of different rock types were calculated,and the identification standards were established by adopting Ca/Mg and Mg crossplot chart method.By using this standard,the dolomitization degree of drilling this area is identified,and good results have been achieved.
出处
《录井工程》
2017年第3期48-50,共3页
Mud Logging Engineering
基金
中原油田普光分公司科研项目"普光地区茅口组岩性识别及录井再评价"(编号:31301845-16-ZC0613-0007)
关键词
普光地区
茅口组
X射线元素分析
薄片鉴定
图板法
白云岩化程度
Puguang area
Maokou formation
X-ray element analysis
thin section identification
chart method
dolomitization
