摘要
利用电阻率和声波测井资料估算得到的地层中有机碳含量进行层序地层学分析,可弥补深水沉积体系旋回性不明显的不足,为层序地层单元划分和对比提供依据。首先用△lgR法计算了松辽盆地Gu57井青山口组的有机碳含量,然后利用计算出来的有机碳含量曲线的旋回性,在青山口组识别出4个三级层序旋回和9个四级层序旋回,并进一步划分出水进域和高位域。结果表明基于△lgR值求取有机碳含量具有较高的精度和分辨能力,能够满足深水沉积层序划分的需要。依据有机碳含量的垂向变化趋势,得出了古龙凹陷青山口组时期相对湖平面的升降过程。
With the help of the data of the resistivity and sonic well logging, the sequence stratigraphy analysis is conducted by the estimated organic carbon content, thus the deficiencies of unobvious cycle of the deep-water sedi- mentary system can be made up and moreover the evidences for the classification and contrast of the sequence strati- graphic units can be presented. First of all, the organic carbon values are computed by AlgR method for Qingshank- ou Formation in Well Gu57 of Songliao Basin, and then by means of the cyclicity of the calculated organic carbon curve, four third-order sequence cycles and nine fourth-order sequence cycles are recognized in the formation, and furthermore the transgression and high standard system tracts are divided. The achievements show that the obtained organic carbon values are characterized by much higher precision and resolution on the basis of the AlgR values, so the requirements of the classification of the deep-water sedimentary sequences can be met. With the vertical varia- tion tendency of the values, the rise and drop processes corresponding to the lacustrine level are presented in the period of Qingshankou Formation in Gulong Sag.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2016年第1期48-52,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
国家科技重大专项"岩性地层油气藏成藏规律
关健技术及目标评价"(2011ZX05001002)资助
关键词
有机碳含量
△lgR法
层序地层分析
松辽盆地
青山口组
organic carbon
△lgR method
sequence stratigraphy analysis
Songliao Basin
Qingshankou Forma-tion
