摘要
吉木萨尔凹陷芦草沟组混积岩为陆源碎屑与碳酸盐岩混积而成的细粒岩储层,矿物岩石类型复杂多样,岩性识别难度极大,严重制约了水平井开发过程中Ⅰ类“甜点”的钻遇率。以X射线荧光(XRF)分析方法为主,X射线衍射(XRD)方法、岩石薄片、岩心及测录井资料为辅,在综合分析矿物岩石类型及质量分数、元素质量分数的基础上,利用代表碳酸盐岩的Mg元素与代表陆源碎屑的K元素交会建立的岩性解释模型,较好地区分出研究区的6类主要岩性(长石岩屑砂岩、粉细砂岩、云质砂岩、砂质云岩、泥晶白云岩、泥岩);梳理了水平井导向控制点的元素特征,并以实例阐述了钻井过程中井轨迹的元素变化规律,为水平井轨迹导向提供了重要依据。该研究成果不仅对混积岩岩石学具有重要的理论意义,而且对页岩油的开发具有十分重要的实践意义。
The mixed rocks of Lucaogou Formation in the Jimsar Sag is a fine-grained rock reservoir formed by a mixture of terrigenous clastics and carbonates.The types of minerals and rocks are complex and diverse,and the lithology identification is extremely difficult,which severely restricts the sweet point drilling rate of class I in the process of the development of horizontal well.In this paper,taking X-ray fluorescence(XRF)spectrum analysis method as the main method,X-ray diffraction(XRD),rock slices,cores,and logging data as theauxiliary methods,on the basis of comprehensive analysis of mineral rock type,mass fraction and element content,the element cross plot of Mg(the element of Mg,which represents carbonate rocks)and K(the element of K,which represents terrigenous clastics)were used to establish a lithological interpretation model,which can distinguish the six main lithologies in the study area(arkose sandstone,silty sandstone,cloudy sandstone,sandy dolomite,micrite dolomite and mudstone).The element characteristics of horizontal well geosteering control points were summarized,and the element change rule of well trajectory in the drilling process was illustrated with an example,which provides an important basis for horizontal well trajectory guide.The research results are not only of great theoretical significance to the petrology of mixed petrology,but also of great practical significance to the development of shale oil.
作者
印森林
李弘林
许长福
郭海平
程乐利
吴有鑫
YIN Senlin;LI Honglin;XU Changfu;GUO Haiping;CHENG Leli;WU Youxin(Institute of Mud Logging Technology and Engineering,Yangtze University,Jingzhou 434023,Hubei;School of Geosciences,Yangtze University,Wuhan 430100,Hubei;Xinjiang Oilfield Branch,CNPC,Karamay 834000,Xinjiang)
出处
《长江大学学报（自然科学版）》
CAS
2021年第2期16-27,共12页
Journal of Yangtze University(Natural Science Edition)
基金
国家自然科学青年基金项目“冲积扇储层孔隙结构复杂模态成因机制及其分布模式”(41502126)
“海相浪控砂质临滨坝沉积构型差异性及沉积动力学机制研究”(41902155)
国家科技重大专项“我国含油气盆地深层油气分布规律与资源评价”(2017ZX05008-006-004-002)。
