塔里木盆地中央隆起区下志留统柯坪塔格组划分对比及分布规律

CORRELATION AND DISTRIBUTION OF THE LOWER SILURIAN KALPINTAG FORMATION IN THE CENTRAL UPLIFT,TARIM BASIN,XINJIANG,NW CHINA

本文总结了塔里木盆地西北缘露头剖面和典型钻井(草1井与托甫2井)剖面柯坪塔格组岩电及生物特征,并在此基础上对中央隆起区32口主要钻井的柯坪塔格组进行连井地层划分对比及地震剖面标定追踪。结合对等T0图分析,探讨了研究区柯坪塔格组三段分布规律。研究表明,柯坪塔格组上段分布最广,除麻扎塔格-塘参1-顺南地区以南没有发育外,其余地区均有发育,地层厚度一般在100—300m不等,在顺托果勒地区及方1井区以北分布厚度最大,超过了300m。柯坪塔格组上段总体分布表现出南薄北厚、东西分布不均的特点。柯坪塔格组中段与柯坪塔格组下段分布局限,仅在和4-顺西1-顺南3-塔中32井以北地区有发育。柯坪塔格组中段厚度一般只有40—60m,柯坪塔格组下段厚度一般为200—300m,两者厚度均表现出南薄北厚的分布特点。

Based on a detailed summary on rock electrical and biological characteristics of the Kalpintag Formation from outcrop section and typical drilling wells（Cao 1and Tuofu 2）,32 main drilling well subdivision and correlation from Central Uplift were carried out.Through the stratigraphic correlation,seismic calibration tracking and the analysis of Seismic T0 diagram,the discussion of stratigraphic distribution of 3 Members from the Kalpintag Formation was conducted.The Upper Member of the Kalpintag Formation was widely distributed except the south region of Mazhatage-Tangcan 1well-Shunnan area.Its thickness ranges from 100 mto 300 m,but it is more than 300 min Shuntuoguole area and Fang 1well area.The distribution shows the characteristics of thin in the south and thick in the north.The distribution of the Middle and Lower Members of Kalpintag Formation is limited,and only developed in the north region of wells He 4,Shunxi 1,Shunnan 3and Tazhong 32.The thickness of the Middle Member of the Kalpintag Formation is 40—60m,the thickness of the Lower Member of the Kalpintag Formation is 200—300 m,both thicknesses show a distribution characteristics of thin in the south,and thick in the north.