Hydrocarbon accumulation in the northwest Chaluhe Fault Depression, Yitong Basin, North ChinaAustralian Journal of Earth Sciences

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Authors
C. E. Cai, Z. Liu, N. S. Qiu, J. L. He, S. H. Xu
Year
2015
DOI
10.1080/08120099.2015.1054881
Subject
Earth and Planetary Sciences (miscellaneous) / Earth and Planetary Sciences (all) / Environmental Science (all)

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Hydrocarbon accumulation in the northwest Chaluhe

Fault Depression, Yitong Basin, North China

C. E. Caia, Z. Liua, N. S. Qiua, J. L. Heb & S. H. Xua a State Key Laboratory of Petroleum Resource and Prospecting, China University of

Petroleum, Beijing 102249, PR China b Exploration Department of PetroChina Jilin Oilfield Company, Songyuan, Jilin 138000,

PR China

Published online: 06 Jul 2015.

To cite this article: C. E. Cai, Z. Liu, N. S. Qiu, J. L. He & S. H. Xu (2015) Hydrocarbon accumulation in the northwest

Chaluhe Fault Depression, Yitong Basin, North China, Australian Journal of Earth Sciences: An International Geoscience

Journal of the Geological Society of Australia, 62:4, 513-527, DOI: 10.1080/08120099.2015.1054881

To link to this article: http://dx.doi.org/10.1080/08120099.2015.1054881

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Hydrocarbon accumulation in the northwest Chaluhe Fault

Depression, Yitong Basin, North China

C. E. CAI1*, Z. LIU1*, N. S. QIU1, J. L. HE2 AND S. H. XU1 1State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum,

Beijing 102249, PR China 2Exploration Department of PetroChina Jilin Oilfield Company, Songyuan, Jilin 138000, PR China

The Yitong Basin is a strike-slip fault basin, which tectonically belongs to the northern section of the Tanlu

Fault Zone. Exploration has demonstrated that the northwest Yitong Basin is a hydrocarbon enrichment zone. However, the complex geological conditions and a poor understanding of the accumulation models and hydrocarbon enrichment factors have impeded petroleum exploration in the basin. This paper focuses on the hydrocarbon accumulation processes in the strike-slip fault zone in the northwest

Yitong Basin. We proposed the reservoir critical porosity concept for reservoir dynamic evaluation. A mathematical model for sandstone porosity evolution in the northwest Chaluhe Fault Depression is established to reconstruct the sandstone porosity over geological time. A fault critical burial depth is proposed to evaluate the present fault-sealing property. The critical condition for oil charge into sandstone was also simulated using an oil-charge simulation experiment. The results indicate that the reservoir critical porosity of the Shuangyang Formation in the northwest Chaluhe Fault Depression was 11% during the accumulation. The present tight sandstone reservoirs in the northwest Yitong Basin were conventional reservoirs during the hydrocarbon accumulation with relatively high porosity and permeability, beneficial for hydrocarbon accumulation at the time. The critical burial depth of faults in the middledeep layers is 2050 m in the northwest Chaluhe Fault Depression. The hydrocarbons can be effectively sealed when the burial depth of the fault is greater than the critical burial depth. The critical hydrocarbon accumulation threshold for a sandstone reservoir depends on the coupling of reservoir critical porosity and critical injection pressure during hydrocarbon accumulation. We put forward three hydrocarbon accumulation plays for the northwest Chaluhe Fault Depression: (1) extensional fault block play, which is close to the source rock and experienced two stages of hydrocarbon accumulations; (2) flower structure play, which is far away from the source rock and is characterised by a late hydrocarbon charge and accumulation; and (3) fault-lithological play, which is far away from the source rock and experienced a late hydrocarbon accumulation. For the Yitong Basin, reservoir properties and faulting appear to be the main controlling factors for hydrocarbon accumulations.

KEY WORDS: Yitong Basin, Chaluhe Fault Depression, porosity evolution process, reservoir critical property, fault critical sealing property, hydrocarbon accumulation model.

INTRODUCTION

Hydrocarbon accumulation is a complex dynamic geological process, which is controlled by several key geological elements. After matching a series of crucial geological conditions, oil and gas can form commercial accumulations. Hydrocarbon accumulation is usually considered as slow and continuous migration processes under the buoyancy and hydrodynamic force. Since the 1990s, episodic fluid injection has been recognised and proved to be an important and efficient way for hydrocarbon accumulation (Hunt 1990; Whelan et al. 1994;