吐哈盆地前侏罗系油气运聚散失烃量模拟研究

Modeling of hydrocarbon wastage amount in the process of pre- Jurassic hydrocarbon migration and accumulation in the TurpanHami basin

油气运移过程中的损耗量与聚集量是互补的，准确计算损耗量对于资源评价具有重要意义。将损耗烃量分为烃源岩残留烃量、储集层滞留烃量、盖前排失烃量、运移流散烃量以及构造破坏烃量５个部分。通过地质分析和研究建立了这５种损耗烃量的计算模型，并且将其应用于吐哈盆地前侏罗系资源评价。计算出吐哈盆地前侏罗系的烃源岩残留烃量为 ５． ４３８ × １０１０ｔ（油气当量），占生烃量的 ６７． ９％；储集层滞留烃量为３．４７９ × １０９ｔ，占生烃量的 ４． ４７％；盖前排失烃量为１．１４ × １０９ｔ，占生烃量的１．４６６％；运移流散烃量为１．２６６ × １０１０ ｔ，占生烃量的１５．２７％；构造损失烃量为９． ６５３ × １０９ｔ，占生烃量的１１． ４％。理论研究和实际应用表明，通过计算运移过程中的损耗烃量来计算运聚系数、可供聚集烃量及远景资源量是可行并有效的。

In this paper, the hydrocarbon amount wasted during migration and accumulation is divided into five parts, which includes hydrocarbon retention amount in source rock, hydrocarbon retention amount in reservoir, hydrocarbon expulsion amount before the forming of regional sealing, hydrocarbon dissipation amount during migration and hydrocarbon amount destroyed by tectonic movements. Based on geologic analysis and study, calculation models of those five parts are constructed and applied to resource evaluation for pre-Jurassic in Turpan-Hami basin. The result shows that hydrocarbon retention amount in source rock is 5. 438 × 1010t (oil equivalent), accounting for 67. 9 % of the amount of hydrocarbon generated; hydrocarbon retention amount in reservoir is3. 479 × 109 t, accounting for 4. 47 % of the amount of hydrocarbon generated; hydrocarbon expulsion amount before the forming of regional sealing is 1. 14 × 109 t, accounting for 1. 466% of the amount of hydrocarbon generated; hydrocarbon dissipation amount during migration is 1. 266 × 1010t, accounting for 15. 27% of the amount of hydrocarbon generated; and the amount of hydrocarbon destroyed by tectonic movements is 9. 653 × 109t, accounting for 11. 4% of the amount of hydrocarbon generated.