论文详情
以鄂尔多斯盆地北部杭锦旗地区上古生界泥质烃源岩为研究对象,利用该区70余口井的测井资料,在综合分析不同类型烃源岩测井曲线特征的基础上,利用ΔlogR技术对太原组和山西组山1段、山2段泥质烃源岩进行了识别和评价。研究区泥质烃源岩测井曲线表现为高自然伽马、高声波时差、高电阻率、高补偿中子和低密度特征。太原组泥质烃源岩南厚北薄,有机碳含量(CTOC)在西南部和中部的锦98井区、锦69井—锦90井区为高值区、东北部为低值区;山西组山1段泥质烃源岩南厚北薄,有机碳在中部、南部含量较高,而西部、北部含量较低;山西组山2段泥质烃源岩总体西南厚东北薄,有机碳含量相对较低,仅在锦94井区、锦48井区出现局部高值区。总体来看,杭锦旗地区上古生界太原组和山西组山1段、山2段泥质烃源岩可以作为该区有效的烃源岩,为天然气成藏提供物质基础。
Based on comprehensive analysis on the well log responses of different types of source rock from more than 70 wells,shaly source rock in upper Palaeozoic Taiyuan formation and Shan 1 and Shan 2 members of Shanxi formation were identified and the thickness of source rock and total organic carbon (TOC) were estimated by the ΔlogR technique in Hangjinqi area,north of Erdos Basin.In target area,the logging curves of shaly source rock are characterized by high natural gamma,high acoustic moveout,high resistivity,high compensated neutron and low density.The thickness of shaly source rock in Taiyuan formation presents the characteristics of thinning from south to north.The distribution of TOC in shaly source rock shows a pattern of higher value in the southwest and middle areas (i.e.Well 98,Well 69 and Well 90 blocks) and lower value in the northeast area.The thickness distribution of shaly source rock in Shan 1 member displays the characteristics of thinning from south to north.The distribution of TOC in Shan 1 member shows a pattern of higher value in the south and middle areas and lower value in the western and northern areas.The shaly source rock in Shan 2 member as a whole shows the characteristics of thicker in southwest area and thinner in the northeast area.The TOC in Shan 2 member is relatively lower and partial high TOC value is only presented in Well 94 and Well 48 blocks.Overall,the shaly source rocks in upper Paleozoic Taiyuan formation and Shan 1 and Shan 2 members of Shanxi formation can be regarded as effective source rock in Hangjinqi area,providing fundament for gas accumulation.
中国科学院知识创新工程重要方向项目(Y225014EA2)资助。