西南石油大学学报（自然科学版）Issue(3)：27-34,8.DOI:10.11885/j.issn.1674-5086.2014.02.24.04
恰什古伊地区碳氧同位素地层学分析
Carbon and Oxygen Isotope Stratigraphy Research in Chashgui Area
摘要
Abstract
The effective reservoir in Chashgui Area,Turkmenistan,is Callovian-Oxfordian carbonate rocks. Since the GR curve does not varies much,it is difficult to predict the favorable reservoir distribution. Using the carbon and oxygen isotope from the 41 samples out of the core of the Well Cha-21 in Chashgui Area,combining with the data of the sedimentary evolution, this paper discusses the sea-level changes during the sedimentation of the Callovian-Oxfordian reservoirs. It is shown that the information in the oxygen isotope has been damaged,and the information in the carbon isotope has been preserved. So the carbon isotope can be used to study the isotope stratigraphy and analyze the Palaeo-environment. The calculated salinity index is 128.25∼136.63,which is higher than the division standard between brine and freshwater,so the diagenetic fluid is high salinity brine. The carbon-isotope stratigraphic curve is almost consistent with the global sea-level curve,which proved that the reservoir geologic period is really Callovian-Oxfordian. According to the sea-level change curve,the main reservoirs in Callovian-Oxfordian are divided into 3 sedimentary cycles and 5 evolutionary phases. Those results fill up the blank in the isotopic stratigraphy studies,which are important significance for the in-deep understanding of the law of sedimentary evolution,and predicting the favorable blocks.关键词
同位素地层学/沉积旋回/卡洛夫-牛津阶/恰什古伊地区/土库曼斯坦Key words
isotopestratigraphy/sedimentary cycle/Callovian-Oxfordian/Chashgui Area/Turkmenistan分类
能源科技引用本文复制引用
王强,王兴志,徐剑良,刘斌,张沁..恰什古伊地区碳氧同位素地层学分析[J].西南石油大学学报（自然科学版）,2014,(3):27-34,8.基金项目
中国石油天然气股份有限公司重大专项（2011E-2505，2013D-0904）；国家示范工程（2011ZX-05059）。 （）
