CAJ | 학술논문

对鄂尔多斯盆地南部页岩气井进行井口生产气取样、岩心解析气取样，进行天然气组分分析和碳氢同位素测试。明确了延长组长7段、长9段天然气组分特征，碳氢同位素特征，结合天然气分析相关图版探讨了天然气的成因类型及来源。结果表明，研究区天然气为有机成因气，干燥系数小，含有一定量的重烃成分，属于典型的湿气，排除了生物气及高温裂解气的可能。乙烷碳同位素特征及天然气类型图版分析表明该区页岩气为典型的油型气。长7段页岩气碳同位素组成序列整体为δ13 C1﹤δ13 C2﹤δ13 C3﹤δ13 C4，为正常序列，少量样品显示同位素反转，长9段长7段页岩气碳同位素组成序列为δ13 C1﹤δ13 C2﹤δ13 C3﹤δ13 C4。认为长7段页岩气来自本层段张家滩页岩，但局部地区存在运移通道，发生了天然气混合，长9段页岩气来自于长9段李家畔页岩。
대악이다사분지남부혈암기정진행정구생산기취양、암심해석기취양，진행천연기조분분석화탄경동위소측시。명학료연장조장7단、장9단천연기조분특정，탄경동위소특정，결합천연기분석상관도판탐토료천연기적성인류형급래원。결과표명，연구구천연기위유궤성인기，간조계수소，함유일정량적중경성분，속우전형적습기，배제료생물기급고온렬해기적가능。을완탄동위소특정급천연기류형도판분석표명해구혈암기위전형적유형기。장7단혈암기탄동위소조성서렬정체위δ13 C1﹤δ13 C2﹤δ13 C3﹤δ13 C4，위정상서렬，소량양품현시동위소반전，장9단장7단혈암기탄동위소조성서렬위δ13 C1﹤δ13 C2﹤δ13 C3﹤δ13 C4。인위장7단혈암기래자본층단장가탄혈암，단국부지구존재운이통도，발생료천연기혼합，장9단혈암기래자우장9단리가반혈암。
Shale gas samples from production and core desorption were collected in the south of Ordos basin. Com-position and isotopes of carbon and hydrogen were tested and analyzed. Combining with diagram of natural gas type,we discussed the shale gas type and its origin in the chang7 and chang9 member. The result showed as fol-lows:the natural gas of the two members was organic origin. With small dry coefficient and a certain amount of heavy hydrocarbon,the gases were typical wet gas,not biogenic and thermal -cracking. 13C of ethane showed that the natural gases were typical organic genetic oil type gas. In general,the isotope of chang7 shale gas carbon was characterized by δ13 C1 ﹤δ13 C2 ﹤δ13 C3 ﹤δ13 C4 ,while small amount of samples showed reversal sequence. The iso-tope of chang9 shale gas carbon was characterized by δ13 C1 ﹤δ13 C2 ﹤δ13 C3 ﹤δ13 C4 . We could draw the conclusion that the origin of chang7 shale gas was Zhangjiatan shale,in some part of which migration pathway developed. Free gas may come through the pathway and mixed. The chang9 shale gas came from Lijiapan shale.