CAJ | 학술논문

CO2是塔北、塔中天然气中常见的非烃组分。各油气区内的天然气中CO2的δ13C值尽管有差别，但其表征的成因意义基本一致。塔中天然气中的CO2可能存在两种来源，一种来源于烃源岩岩石和矿物及胶结物分解；第二种来自二叠纪火山活动过程中的脱气。轮台凸起构造单元上油气藏(除雅克拉外)中CO2来自库车坳陷T－J陆相烃源岩中有机质转化。东河塘天然气中CO2来自寒武－奥陶海相碳酸盐岩岩石分解及泥岩中碳酸盐矿物分解。
CO2시탑북、탑중천연기중상견적비경조분。각유기구내적천연기중CO2적δ13C치진관유차별，단기표정적성인의의기본일치。탑중천연기중적CO2가능존재량충래원，일충래원우경원암암석화광물급효결물분해；제이충래자이첩기화산활동과정중적탈기。륜태철기구조단원상유기장(제아극랍외)중CO2래자고차요함T－J륙상경원암중유궤질전화。동하당천연기중CO2래자한무－오도해상탄산염암암석분해급니암중탄산염광물분해。
Carbon dioxide is one of the non-hydrocarbons which occur in natural gases in northern and central Tarim Basin. The δ13C values of carbon dioxide are different from one oil (gas) field to another, but all the δ13C values of carbon dioxide from the same oil (gases) field imply that CO2 is relatively homogeneous in origin. The five δ13C values of carbon dioxide in central Tarim Basin are within the carbon isotopic range of abiogenic carbon dioxide ,and the carbon dioxide probably has two sources : one originated from the decomposition of hydrocarbon-source rocks or carbonate minerals and carbonate cements in the hydrocarbon-source rocks, and the other from degassing during Permian volcanism in central Tarim Basin. Carbon dioxide in natural gases from oil (gas) deposits (except Xa-Ke-La oil (gas) field) in the Luntai salient originated from the Permian-Jurassic continental facies hydrocarbon-source rocks. The contents of CO2 in natural gases from the Denhetang oil (gas) field are very high ,and the δ13C values are within the carbon isotopic range of abiogenic carbon dioxide ,and carbon dioxide was derived from decomposition of the Cambrian-Ordovician marine facies carbonate rocks and carbonate minerals in mudstones.