Source of the condensates from the Hetianhe Field and the genetic relationship between the condensates and their associated gases

Abstract

A detailed correlation of Hetianhe condensates versus typical source rocks from the Tarim Basin was established. Moreover, the genetic relationship between the condensates and their associated gases was also studied based on their geochemical compositions and fluid inclusion data. Hetianhe condensates are characterized by high pristine/phytane (Pr/Ph) ratios, high relative abundances of C 28 regular steranes, C 26 -C 27 triaromatic steroids, and triaromatic dinosteranes, and relatively heavy stable carbon isotopic compositions. They geochemically correlate well with the Cambrian source rocks, indicating that these condensates are derived from the Cambrian rocks. Based on several molecular maturity parameters, the condensates are recognized as being moderately to highly mature, which are too low in maturity to extensively crack into gases. The gases and condensates of the Hetianhe Field are derived from the same source rocks and the gases are from oil-cracking; however, clear evidence indicates that the gases were not cracked from their associated condensates and that the gas generation from oil-cracking did not occur in the present reservoirs. The liquid condensates produced from wellheads were likely dissolved in their associated gases underground and carried into the reservoirs by the gases. Hetianhe Field, condensate, maturity, oil-source rock correlation, genetic relationship Citation: Song D F, Wang T G, Li M J, et al. 2015. Source of the condensates from the Hetianhe Field and the genetic relationship between the condensates and their associated gases. Science China: Earth Sciences,

Elevated Mango’s K1 Values Resulting from Thermochemical Sulfate Reduction within the Tazhong Oils, Tarim Basin

“…To test whether the invariant K 1 values observed by Mango also occur in the Tarim Basin oils, 70 samples, representing nearly all petroleum types from biodegraded heavy oils to condensates, were selected and the source rocks were from Cambrian–Ordovician marine carbonates and shales (Tabei and Tazhong Uplift oils), ,, lake mudstones (Dalaoba oils), and terrigenous coals (Luntai oils). , …”

Triaromatic dinosteroids – Isomeric distributions and their geochemical significance

“…Most of these reports have focussed on the Cambrian O1 source unit in the Tarim Basin and associated oils, particularly the Tadong-2 oil (e.g. Zhang et al, 2000;Ma et al, 2008;Li et al, 2012;Song et al, 2015;Huang et al, quadrupole instrument, tuned to unit m/z resolution, with argon as the collision gas at an energy of 15 V. The GC column was as above, but with a temperature programme of 50 • C (1 min. isothermal) to 115 • C at 20 • / min.…”