非稳态油藏理论及其在伊朗 A 油田的应用

doi:10.3969/j.issn.1673-8926.2015.06.017

LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (6): 125-131.doi: 10.3969/j.issn.1673-8926.2015.06.017

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Theory of unsteady reservoir and its application in A oilfield of Iran

Chen Jie ¹,Du Yang ¹,Peng Pai¹,Huang Hexiong ²,Tong Mingsheng ¹,Xiong Shu³

1. Research Institute of Geology Exploration and Development ， CNPC Chuanqing Drilling Engineering Company Ltd. ，Chengdu 610051 ， China ； 2. CNPC （ Iran ） Company ， Beijing 100034 ， China ； 3. China Universtity of Petroleum ，Beijing 102249 ， China

Online:2015-12-20 Published:2015-12-20

Abstract

Abstract:

The oil-water contract （OWC） of Sarvak reservoir of A oilfield in Iran is characterized by a large-amplitude one tilting from north to south. The hydrodynamic force is not the cause and the reservoir heterogeneity is not the main reason for the tilted OWC of the Sarvak reservoir. The main reason for the large-amplitude tilted OWC is the structure adjustment. Based on the analysis of sedimentary and tectonic evolution, formation flattening technique is utilized to recover the paleo-structure of different geologic stages. Combined with accumulation factor analysis, it is considered that the adjustment of traps is caused by Zagros orogeny and the structure adjustment rate is faster than the hydrocarbon adjustment rate. Now, the Sarvak reservoir is still in the new condition of migration, accumulation and adjustment, which is an unsteady reservoir. A paleo-trap which decreased from north to south formed in the Sarvak Formation in A oilfield after the late Paleocene. The Zagros orogeny during the Neogene caused the adjustment of the trap, and the former low point in the south uplifted significantly and gave birth to a new secondary trap. So, today the structure in the south of Sarvak Formation is higher than that in the north. The balance in the paleo-trap was broken, and hydrocarbon migrated to the secondary trap in the south. The large-amplitude tilted oil-water contract showed that the paleoreservoir was still adjusting and unstable. The favorable development zone is the high zone of paleostructure which is in the western Sarvak reservoir, followed by the belt of transition between paleostructure and current structure.

Key words: shale , pore structure , low-pressure nitrogen adsorption , high-pressure mercury injection , nuclear magnetic resonance , quantitative characterization , Longmaxi Formation , Sichuan Basin

Chen Jie,Du Yang,Peng Pai,Huang Hexiong,Tong Mingsheng,Xiong Shu. Theory of unsteady reservoir and its application in A oilfield of Iran[J].LITHOLOGIC RESERVOIRS, 2015, 27(6): 125-131.

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