GAS COMPONENTS AND THE ORIGIN IN FEIXIANGUAN FORMATION GAS POOL, NORTHEAST OF SICHUAN

doi:10.3863/j.issn.1000-2634.2007.05.09

西南石油大学学报(自然科学版) ›› 2007, Vol. 29 ›› Issue (5): 34-37.DOI: 10.3863/j.issn.1000-2634.2007.05.09

• 地质勘探 • Previous Articles Next Articles

GAS COMPONENTS AND THE ORIGIN IN FEIXIANGUAN FORMATION GAS POOL, NORTHEAST OF SICHUAN

ZHU Ya-dong^1,2 WANG Yun-cheng¹ GAO Pei-cheng² et al.

College of Energy Resources,Chengdu University of Technology,Chengdu Sichuan 610054,China

Received:2007-01-20 Revised:1900-01-01 Online:2007-10-20 Published:2007-10-20
Contact: ZHU Ya-dong

Abstract

Abstract: In northeast Sichuan Basin， Feixianguan Formation gas pools are rupewrdry gas ones with lots of H₂S, over matured， and the pressure are normal or lower. The strata were embeded deeply and experienced high temperature in geologic history, the conditions that oil cracked into gas existed. The components of fluid inclusions prove the original Feixianguan Formation gas pool contains a lot C⁺² hydrocarbons and liquid bitumen， but no H₂S， and prove that the gas pool evolved from crude oil. The there was thermochemical reduction reaction between cracked gas and sulphate， consumed a lot C⁺² hydrocarbons，generated lots of H₂S and CO₂. So，the gas pool contain lots of H₂S，and has over matured character. TSR generated a lot acid， the acid eroded the reservoir and increased the pore space. Furthermore， a great lot of H₂S and CO₂ dissolved in water，so， the pressure of gas pool is lower.

Key words: Feixianguan Formation, cracking gas, thermochemical sulphate reduction（TSR）, fluid inclusion, Sichuan Basin

CLC Number:

ZHU Ya-dong;WANG Yun-cheng GAO Pei-cheng et al.. GAS COMPONENTS AND THE ORIGIN IN FEIXIANGUAN FORMATION GAS POOL, NORTHEAST OF SICHUAN[J]. 西南石油大学学报(自然科学版), 2007, 29(5): 34-37.

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GAS COMPONENTS AND THE ORIGIN IN FEIXIANGUAN FORMATION GAS POOL, NORTHEAST OF SICHUAN

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