蚀变闪长岩潜山储层矿物组分特征与孔隙度的关系  

The relationship between mineral composition characteristics and porosity of altered diorite buried hill reservoir

作　　者：毛敏 袁胜斌 张立刚[2,3] 李大冬[1] 苗振华 李浩 MAO Min;YUAN Shengbin;ZHANG Ligang;LI Dadong;MIAO Zhenhua;LI Hao(China France Bohai Geoservices Co.,Ltd.,Tianjin 300457,China;Northeast Petroleum University,Heilongjiang Daqing 163318,China;Key Laboratory of Enhanced Oil Recovery,Ministry of Education,Heilongjiang Daqing 163318,China)

机构地区：[1]中法渤海地质服务有限公司,天津300457 [2]东北石油大学,黑龙江大庆163318 [3]提高油气采收率教育部重点实验室,黑龙江大庆163318

出　　处：《非常规油气》2022年第6期14-19,33,共7页Unconventional Oil & Gas

基　　金：国家自然科学基金项目“致密储层井工厂压裂应力场演化机理及调控方法”(51504067)。

摘　　要：蚀变闪长岩潜山储层在惠州26-6区块油气田前古进系广泛发育,由于其强烈的非均质性,给潜山储层的预测和识别带来困难。为建立快速有效的储层物性评价方法,对惠州26-6区块蚀变闪长岩壁心进行了X-射线衍射实验、薄片分析实验和孔隙度实验,研究了矿物组分及其衍生参数与孔隙度的对应关系。结果表明:区域蚀变闪长岩矿物组分主要有斜长石、角闪石、钾长石、黄铁矿、石英、绿泥石、高岭石和白云石等,其中斜长石含量为9.3%~22.9%,角闪石含量为12.9%~23.4%,钾长石含量为4.7%~11.1%。随着石英、绿泥石、高岭石和方解石含量升高,孔隙度增大。孔隙度低值区,随着斜长石和钾长石含量增大,孔隙度升高;随着角闪石和黄铁矿增大,孔隙度减小。孔隙度高值区,随着斜长石和钾长石含量增大,孔隙度减小;随着角闪石和黄铁矿增大,孔隙度升高。衍生参数色率比、绿泥石和高岭石蚀变指数以及方解石填充指数与孔隙度均有较高的相关性。该研究成果能够为基于X-射线衍射全岩录井的潜山蚀变闪长岩储层物性随钻识别提供参考。Altered diorite buried hill reservoirs are widely developed in the pre-Paleozoic Huizhou 26-6 block oil and gas field.It is hard to predict and identify the buried hill reservoirs because of the strong heterogeneity.For establishing a rapid and effective evaluating reservoir property method,the X-ray diffraction experiment,thin section analysis experiment and porosity experiment were carried out on the altered diorite side-wall core in Huizhou 26-6 block.The relationship between mineral composition and its derived parameters and porosity is studied.The results show that:the mineral components mainly include plagioclase,hornblende,potassium feldspar,pyrite,quartz,chlorite,kaolinite and dolomite,among which the content of plagioclase is 9.3%~22.9%,the content of hornblende is 12.9%~23.4%,the content of potassium feldspar is 4.7%~11.1%and the content of pyrite is 5.3%~9.4%.The porosity increases with the increase of quartz,chlorite,aleck and calcite.In the low porosity region,the porosity increases with the increase of plagioclase and potassium feldspar content,and decreases with the increase of hornblende and pyrite content.In the high porosity region,the porosity increases with the increase of hornblende and pyrite content,while decreases with the increase of plagioclase and potassium feldspar content.The color rate ratio,chlorite and kaolinite alteration index and calcite filling index model have higher correlation with porosity.The research results can provide a reference for the physical property identification of buried hill altered diorite reservoir based on X-ray diffraction whole-rock logging.

关 键 词：蚀变闪长岩 惠州26-6区块油气田 矿物组分 色率比 绿泥石和高岭石蚀变指数 方解石填充指数 

分 类 号：TE122.9[石油与天然气工程—油气勘探]