Unformatted text preview: pth map & not existed in TWT map, so there is a big error occurred & can`t to drill in this closure depending on Depth map only. • The values in TWT map must be divided by 2 (to convert it to One Way Time map). ………………………………………………………………………….. Original Oil in Place (OOIP):
Oil in place is the total hydrocarbon content of an oil reservoir and is often abbreviated STOOIP, which stands for Stock Tank Original Oil in Place, or STOIIP for Stock Tank Oil Initially In Place, referring to the oil in place before the commencement of production. OOIP under Reservoir conditions: It is measuring the OOIP where oil is compressed by pressure in layers. In this case, the OOIP is calculated by: OOIP=k*Thickness*A*Φ*(1‐Sw)*(Net/Gross) Where: k→ unit convergent constant Thickness→ thickness of reservoir A→ Area of reservoir Φ→ Total porosity Sw→ Water saturation Net/Gross→ Effective porosity to the total volume of reservoir 50 Geology & Geophysics in Oil Exploration Mahmoud Sroor Geology & Geophysics in Oil Exploration OOIP under surface conditions: In this case, we care about the expansion of oil at the surface (due to the pressure decreasing at surface). Also at surface conditions, bubbles escape out of the oil. As the gas bubbles out of the oil, the volume of the oil decreases. Stabilized oil under surface conditions is called stock tank oil. Oil reserves are calculated in terms of stock tank oil volumes rather than reservoir oil volumes. The Formation Volume Factor (FVF) or Beta Oil (Bo) is used to solve this problem. The ratio of stock tank volume to oil volume under reservoir conditions is called the formation volume factor (FVF). It usually varies from 1.0 to 1.7 (Reservoir engineer determine value of FVF from Pressure Volume Temperature Log). In this case, the OOIP is calculated by: OOIP=k*Thickness*A*Φ*(1‐Sw)*(Net/Gross)*FVF Where: FVF→ Formation Volume Factor Producable Oil in Place: In real case, not all of oil in reservoir can be est...
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- Spring '10
- Geology, Volcano, Tephra, Volcanic Ash, Geology & Geophysics, Mahmoud Ahmed Sroor