粘土膜对砂岩储集性能的影响——以塔里木盆地群6井区泥盆系东河塘组下段为例

INFLUENCE OF CLAY MINERALS MEMBRANE ON SANDSTONE RESERVOIRS——A CASE STUDY ON THE LOWER DONGHETANG RESERVOIRS OF THE DEVONIAN OF WELL QUN 6 IN THE TARIM BASIN

张惠良 张荣虎 王月华 朱国华 张春莲

Zhang Huiliang Zhang Ronghu Wang Yuehua Zhu Guohua Li Yuwen

中国石油勘探开发研究院, 杭州地质研究所, 杭州, 310023 2. 塔里木油田分公司勘探开发研究院, 新疆, 库尔勒, 841000

Hangzhou Institute of Geology, Research Institute of Petroleum Exploration and development of China, HangZhou, Zhejiang 310023, China 2. Research Institute of Petroleum Exploration and development, Tarim Oil Field Branch Company, Korla, Xinjiang, 841000, China

通过对岩石的铸体薄片、扫描电镜、压汞及物性等资料分析认为:塔里木盆地群6井区泥盆系东河塘组下段砂岩中粘土矿物薄膜的成因可分为原生式和自生式,其中以自生式为主。粘土矿物薄膜的形成期往往在成岩早期(或同生成岩期),粘土膜的发育与面孔率基本成正相关关系,与储层孔隙结构成负相关关系。东河塘组下段粘土膜发育的储层(泥质含量0.5%~3%)孔隙度一般为7%~17.6%,平均为11.53%,渗透率一般为(0.1~10)×10-3μm2,平均为4.15×10-3μm2;明显高于东河塘组上段粘土膜不发育储层物性,其孔隙度平均为5.23%,渗透率平均为2.88×10-3μm2。粘土膜与储层沉积相带、储层温压系统及早期油气注入较为密切,一般在临滨相带的下临滨—中临滨微相中较为常见,而在泥质淘洗相对干净的上临滨—前滨微相中难以保存,成岩早期油气的注入及异常高压封存体系(群6井区压力系数为1.59)的存在对粘土膜的保存完好起到决定性作用。

According to cast liquid photo,scan electron microscope,impressing hydrargyrum,quality etc.,the research thinks that clay minerals membrane of the lower Donghetang reservoir of the Devonian in well qun 6 area of the Tarim Basin is divided into original cause and self-generating cause,among them with self-generating cause for most.Clay minerals membrane usually comes into being in earlier diagenetic stage(or developing together diagenetic stage),which have a just relation to the face porosity of the reservoir,and a negative relation to the pore structure.Porosity of the lower Donghetang reservoir developing clay minerals membrane is most of 7%~17.6%(mean of 11.53%)and permeability is most of(0.1~10)×10-3μm2(mean of 4.15×10-3μm2),and these quality is obviously higher than the upper Donghetang reservoir not developing clay minerals membrane,whose mean porosity is 5.23% and mean permeability is 2.88×10-3μm2.Clay minerals membrane has a close relation to depositional facies,temperature and pressure system of reservoir,earlier hydrocarbon infusion.Generally speaking,clay minerals membrane develops in lower-middle shore face more familiar,while is short in the upper shore face and foreshore where clay is washed cleanlily.Hydrocarbon infusion in earlier diagenetic stage and abnormal high pressure system(well qun 6 area pressure coefficients for 1.59)have crucial function to protect clay minerals membrane.

"十五"国家重点科技攻关后两年滚动课题(2004BA616A02-04-02-04专题).

https://doi.org/10.11781/sysydz200605493