戈壁区油气化探方法有效指标参数研究

STUDY OF THE EFFECTIVE GEOCHEMICAL EXPLORATION METHODS AND INDICATORS USED IN GOBI AREAS

选择新疆准噶尔盆地柴窝堡地区作为戈壁区油气化探方法的研究试验区,从化探方法样品采集技术、测试技术入手,结合研究区已知油气井(柴参1井)的相关地质认识,对不同化探方法(热释烃、物理态吸附气、吸附丝等)有效指标参数进行了研究。结果表明:物理吸附气重烃指标(WLC2+)、热释烃甲烷指标(RC1)和吸附丝(XC4+5)指标均呈环状异常模式,很好地指示了获工业油气流的柴参1井(地)区;物理吸附气组构指标(WLiC4/nC4)呈顶置块状异常模式,亦很好地指示了柴参1井区。因此物理吸附气、吸附丝方法可作为该戈壁区的有效化探方法,热释烃方法可作为该戈壁区的辅助化探方法。

An experimental study has been made by the different geochemical methods （heat-released hydrocarbon, physically absorbed gas, and wire-absorbed gas, etc） in the selected existing well（Well Chaican 1） area. The area selected for studying the geochemical methods, as well as the effective parameters and indicators is a Gobi area in Chaiwobao, the Junggar Basin. The study of comparability and the effectiveness of the geochemical indicators in the known oil-and gas-well （Well Chaican 1） was made by the sampling collection techniques and sample testing techniques of the various geochemical methods. The results showed that the physically absorbed gas （or free gas） and the heat-released hydrocarbon could be used as the main geochemical methods in the selected Gobi area. Some indicators have halo anomaly patterns, consistent well with the existing oil and gas well （Well Chaican 1） area, such as physically absorbed gas C2^＋ and C4＋5, and the acid-extraction el. The ratio of the physically absorbed gas, eg. iC4/nC4, has a apical anomaly pattern, consistent well with the known oil and gas area.