Multi-Factor Controlling Diversity of the Ordovician Hydrocarbon Phase in the Tazhong I Block, Tarim Basin, NW China

Yifeng Wang, Weibing Shen (), Jian Li, Chen Zhang, Hongzhe Xie, Shuo Chen, Quzong Baima and Chunhong Wang
Additional contact information
Yifeng Wang: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Weibing Shen: Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
Jian Li: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Chen Zhang: Oil and Gas Development Department, Tarim Oilfield Company, PetroChina, Krola 841000, China
Hongzhe Xie: Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
Shuo Chen: Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
Quzong Baima: Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
Chunhong Wang: Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Energies, 2024, vol. 17, issue 3, 1-16

Abstract: The distribution characteristics and main controlling factors of hydrocarbon phases in deep strata from petroliferous basins are important for the evaluation of oil–gas resources and decision-making regarding exploration. The distribution characteristics and controlling factors of the Ordovician hydrocarbon phases are systematically analyzed in the Tazhong I block, Tarim Basin, NW China. The results show that the Ordovician reservoirs in the Tazhong I block are characterized as multi-phase reservoirs with a lateral co-existence of condensates, normal oil reservoirs, and heavy oil reservoirs. From east to west, gas-rich in the fault belt and oil-rich in the platform area are presented. Meanwhile, there are regular variations in the geochemical characteristics of the Ordovician hydrocarbon, showing decreasing trends in the gas/oil ratio (GOR), wax contents, dryness coefficients, methane contents, and methane carbonate isotope values (δ 13 C 1 ) and an increasing trend in oil densities. Because the same Cambrian–Lower Ordovician source for the Ordovician hydrocarbon is observed in the Tazhong I block, the regular variations in the hydrocarbon phases and geochemical characteristics can be interpreted as records of gas invasion, biodegradation, multi-stage filling, thermal cracking, and thermochemical sulfate reduction (TSR) rather than controlled by the source rock organofacies. This indicated that different kinds of secondary processes for a diversity of the hydrocarbon phase can appear in one region. Our re-construction of the Ordovician hydrocarbon accumulation model in the Tazhong I block encourages future exploration to target gas reservoirs in the fault belt and oil reservoirs in the platform area.

Keywords: hydrocarbon phase; geochemical analysis; major factor; Ordovician; Tarim Basin (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/17/3/723/pdf (application/pdf)
https://www.mdpi.com/1996-1073/17/3/723/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:17:y:2024:i:3:p:723-:d:1332358

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().