CAJ | 학술논문

哈拉哈塘凹陷作为塔北隆起西部的重要油气单元，其奥陶系碳酸盐岩储层中油气资源丰富，但呈现多相态分布，油气性质变化成因尚不明确。通过详细的地球化学分析揭示了该区油气特征与成因。油—油、油—岩对比表明，原油与中—上奥陶统烃源岩特征更为相近，指示具有成因联系；正构烷烃单体烃碳同位素对比显示，可能有寒武系烃源岩的成烃贡献。哈拉哈塘原油具有相对较高的硫芴含量，C29和C35藿烷相对含量也较高，暗示有碳酸盐岩烃源岩的成烃贡献。傅里叶变换离子回旋共振质谱（ FT－ICR MS）分析表明，哈拉哈塘地区原油中低热稳定性硫化物含量不高，表明当前没有明显的TSR改造迹象。综合分析认为，源岩成熟度是控制深部高气油比原油形成的重要因素，而生物降解等次生作用是控制相对浅层重质油和H2 S形成的重要因素。
합랍합당요함작위탑북륭기서부적중요유기단원，기오도계탄산염암저층중유기자원봉부，단정현다상태분포，유기성질변화성인상불명학。통과상세적지구화학분석게시료해구유기특정여성인。유—유、유—암대비표명，원유여중—상오도통경원암특정경위상근，지시구유성인련계；정구완경단체경탄동위소대비현시，가능유한무계경원암적성경공헌。합랍합당원유구유상대교고적류물함량，C29화C35곽완상대함량야교고，암시유탄산염암경원암적성경공헌。부리협변환리자회선공진질보（ FT－ICR MS）분석표명，합랍합당지구원유중저열은정성류화물함량불고，표명당전몰유명현적TSR개조적상。종합분석인위，원암성숙도시공제심부고기유비원유형성적중요인소，이생물강해등차생작용시공제상대천층중질유화H2 S형성적중요인소。
The Halahatang Sag is an important oil and gas unit in the western part of the Northern Tarim Uplift. The Ordovician carbonate reservoir contains abundant petroleum resources with multiple phases, but the variable characteristics and genetic mechanism of the oil and gas are still unclear. Oil?oil and oil?rock correlations indicate that the crude oil has a close genetic relationship with the middle and upper Ordovician source rocks. The compari?son of carbon isotopes for individual n?alkanes shows that the Cambrian source rocks might also contribute. Halaha?tang oils are rich in dibenzothiophenes, and also contain relatively abundant C29-and C30-hopane, which implies a contribution from carbonate source rocks. Based on the Fourier transform?ion cyclotron resonance mass spectrome?try ( FT-ICR MS) analysis, sulfides with low thermal stability have low concentrations, suggesting that TSR altera?tion is not significant. Source rock maturity is the major factor controlling the genesis of oils with high gas/oil rati?os, while biodegradation is the major factor for heavy oil and H2 S formation in the relatively shallow reservoir.