Reservoir characterization and exploitation potential in Orinoco heavy oil belt in Venezuela
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摘要: 奥里诺科重油带位于东委内瑞拉盆地南部斜坡带,总面积55 000 km2。重油带油藏埋深350~1 200 m,储层主要为渐新统和中新统未固结砂岩,平均孔隙度33.4%,平均渗透率4 760×10-3μm2;油层温度40~55 ℃;油藏压力为常压;超重油重度为7.5°~9° API,原地黏度介于1 000~6 000 cp;油藏有效厚度为6~120 m左右;探明原始地质储量11 220×108 bbl,可采储量2 600×108 bbl。重油带共有5个开发区块,日产油量约72×104 bbl,已形成一套经济可行的开发技术系列。重油带开发区块动用的可采储量仅占重油带可采储量的3%左右,尚具有巨大的勘探开发潜力。Abstract: The Orinoco heavy oil belt is on the southern slope of the Eastern Venezuela Basin, with an area of 55 000 km2. The heavy oil reservoirs were buried 350-1 200 m deep. The unconsolidated sandstones in Oligocene and Miocene worked as the main reservoirs, with the average porosity and permeability of 33.4% and 4 760×10-3 μm2, respectively. Reservoir temperature is 40-55 ℃. Reservoir pressure coefficient is about 1. Super heavy oil API is 7.5 °-9 °. Situ viscosity is 1 000- 6 000 cP. Reservoir effective thickness is 6-120 m. The original proven geologic reserve is 11 220×108 bbl, and the recoverable reserve is 2 600×108 bbl. There are five heavy oil developing blocks with daily oil production of about 72 ×104 bbl. A set of economic and feasible developing technology series has been formed. The recoverable reserve of the developing blocks is about 3% of the total recoverable reserves of heavy oil belt, showing great exploration potentials.
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[1] Maniki Talwali.The Orinoco heavy oil belt in Venezuela[M]. The James A: Baker III Institute for Public Policy of Rice University,2007. [2] Uzicategui E.Reservoir Characterization and exploitation scheme in the Orinoco Oil Belt,SPE 69698.2001. [3] Trebolle R L.The Orinoco heavy oil belt pilot projects and deve-lopment strategy, SPE 25798.1993. [4] Gipson L.J.Hamaca heavy oil project:Lessons learned and an evolving development strategy,SPE/Petroleum Society of CIM/CHOA 78990.2002. -
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