元素录井在川渝地区关键层位岩性识别中的应用

发布时间：2018-06-12 10:02

本文选题：川渝地区 + 关键层位　；参考：《天然气工业》2017年09期

【摘要】：随着川渝地区快速钻井工艺的推广应用,返出岩屑呈细碎甚至粉末状,传统的岩屑岩性识别方法已不能满足要求。为此,根据元素地球化学原理,对该区关键层位开展了元素录井岩性定性识别及定量解释工作。结果表明:(1)不同岩性元素录井特征差异明显,易于识别,如玄武岩为0.35Fe/Si0.55且Ca/(Na+K)4.00,而沉积岩Fe/Si0.35或Fe/Si0.55;(2)沉积岩中可依据(Al+Si+Fe)和(Ca+Mg+S)组合识别出碎屑岩、碳酸盐岩和硫酸盐岩及其过渡岩类,其中(Al+Si+Fe)31%者为碎屑岩,(Al+Si+Fe)8%且(Ca+Mg+S)36%为碳酸盐岩,而(Al+Si+Fe)5%且(Ca+Mg+S)36%则为硫酸盐岩。进一步可根据(Si+K+Ca)和Si/Al、(Al+Si+Fe+K)和(Ca+S)/Mg识别出砂岩、泥(页)岩、石膏、白云岩、石灰岩及其过渡岩类。为便于该方法在现场应用,建立了该区关键层位元素录井岩性识别定性图版并开发了定量解释软件。在川渝地区MX207井等10口井现场应用的效果表明:该方法岩性识别符合率介于88.75%~95.22%,平均符合率达92.42%,能够满足该区关键油气层位随钻岩性快速识别的要求。
[Abstract]:With the popularization and application of rapid drilling technology in Sichuan and Chongqing areas, the back cuttings are fine or even powdered, and the traditional methods of lithology identification of cuttings can not meet the requirements. Therefore, according to the principle of element geochemistry, the qualitative identification and quantitative interpretation of element logging lithology are carried out for the key strata in this area. The results show that the logging characteristics of different lithologic elements are very different and easy to identify. For example, basalt is 0.35 Fe / Si 0.55 and CaR / Na K is 4.00, while in sedimentary rock Fe / Si 0.35 or Fe / Si 0.55 / N 2) the clastic rocks can be identified according to the combination of Al Si Fe) and Ca mg S). Carbonate rocks, sulphate rocks and their transitional rocks, of which 31% of them are clastic rocks, 8% of them are clastic rocks, and 36% are carbonatites, while 5% of Al Si Fe and 36% Ca Ca mg S ~ (3 +) are sulphate rocks. Furthermore, sandstone, mudstone, gypsum, dolomite, limestone and their transitional rocks can be identified according to Si-K Ca), Si-Al Si-Fe K) and Ca / S ~ (+) mg. In order to facilitate the application of this method in the field, a qualitative lithology identification chart of key layer elements in this area was established and a quantitative interpretation software was developed. The results of field application in 10 wells such as MX207 well in Sichuan and Chongqing area show that the lithologic recognition coincidence rate of this method is between 88.75 and 95.22 and the average coincidence rate is 92.42, which can meet the requirements of rapid recognition of lithology while drilling in this area.
【作者单位】：中国石油川庆钻探工程公司地质勘探开发研究院;中国石油长庆油田公司第四采气厂;
【基金】：中国石油集团川庆钻探工程有限公司科研项目“川渝地区关键层位元素录井特征与应用”(编号:CQ2014B-14-1-1)
【分类号】：TE142

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