article

Differential Hydrocarbon Migration and Accumulation in Complex Fissure and  Pore Carbonate Reservoir of Superposition Basin:An Example of  Pore-Fissure-Fracture Reservoir Formed by Supergene Karstification in Tz83 Well Area

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  • 1.Southwest Petroleum University,Chengdu 610500, China;2.Tarim Oilfield Company, PetroChina,Korla 841000, China;3.China University of Petroleum, Beijing 102249, China.

Received date: 2009-02-21

  Revised date: 2009-09-25

  Online published: 2010-02-10

Abstract

Mechanism of hydrocarbon migration and accumulation in complicated carbonate pore\|fissure\|fracture reservoir of the superposition basin is a key scientific problem to be solved. The production of crude oil and natural gas in the Tz83 well area is much high at the intersection point between NE and NW trending faults, gradually decreases away the intersection point and distributes along the structural ridge. This phenomenon is contradiction with the traditional distribution model of gas accumulated in the core while oil accumulated in the limb of an anticline. A conceptual model of the pore-fissure-fractures reservoir formed by supergene karstification was built according to the related carbonate karstification research results. The differential hydrocarbon migration and accumulation in the complex fissure-pore carbonate reservoir is the fate factor causing the abnormal distribution of oil and gas. Hydrocarbon was firstly charged into the nearest hole, pore and fissure; then migrated and charged into the other compartment alone migration pathway after the first compartment filling. Thus hydrocarbon was charged into the compartment in order, with two patterns as follows: ① Preferential accumulation of gas at the hydrocarbon-filling point, while oil accumulation far away the filling point; ② Complex gas-oil-water correlation controlled by the lateral connected networks. The latter pattern of hydrocarbon migration and filling is in coincidence with the oil and gas distribution in Tazhong area. Therefore, the intersection position of the faults is a place of oil and gas filling, and the main pathway of oil and gas migration is along structural ridge. The differential hydrocarbon migration and accumulation in the complex fissure-pore carbonate reservoir give us the following indications: ①Hydrocarbon exploration of fissure and pore reservoir should firstly describe the structure of the fissure-fracture reservoir, and the special distribution of gas-oil-water correlation can be predicted according to main charging point and migration pathway; ②Hydrocarbon exploration should be confined to hydrocarbon charging point and main migration pathway. The exploration aim should not be given up due to some failed wells.

Cite this article

WANG Fu-Huan, HAN Jian-Fa, XIANG Cai-Fu, XU Hong-Feng, ZHANG Yun-Feng, WANG Xia . Differential Hydrocarbon Migration and Accumulation in Complex Fissure and  Pore Carbonate Reservoir of Superposition Basin:An Example of  Pore-Fissure-Fracture Reservoir Formed by Supergene Karstification in Tz83 Well Area[J]. Natural Gas Geoscience, 2010 , 21(1) : 33 -41 . DOI: 10.11764/j.issn.1672-1926.2010.01.33

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