What is Sophih oil and gas?
Abstract. Historically geologists have identified oil and gas prospects by mapping a conventional reservoir’s water saturation (Sw), porosity (Phi) and thickness (H). These three measurements proved to be reliable predictors of reservoir productivity and could be integrated into a single calculation, the SoPhiH map.
How is Sophih calculated?
Hydrocar Ft (SOPHIH) – Hydrocarbon Feet is the summation of each sample interval multiplied by each Porosity/(Condition 1) times 1.0 – Water Sat/(Condition 2) passing all cutoff criteria.
What is net pay oil?
Net pay (net productive) thickness: It is the thickness of those intervals in which porosity and permeability are known or supposed to be high enough for the interval to be able to produce oil or gas, water and gas is not included to the net pay thickness.
What is Net Gross reservoir?
Net-to-gross (NTG) is the fraction of reservoir volume occupied by hydrocarbon- bearing rocks. It is a global attribute and as such no replicate of it can be found over the reservoir.
How do you calculate the effective porosity of a log?
Total porosity minus clay-bound water (CBW). Log effective porosity. In essence, total porosity minus shale water, where solid minerals and the volume of shale (Vsh) constitute the matrix (non-effective porosity) and the remaining volume constitutes the effective porosity.
How do you find effective porosity?
What is the difference between gross thickness and net thickness?
The net thickness of a unit is the thickness of reservoir-quality lithology (usually sand) in the unit. This sometimes tends to be proportional to the seismic amplitude, if the bed’s gross thickness is less than a quarter of the dominant wavelength.
How is oil porosity calculated?
Porosity (ɸ) = (Vp ÷ Vb) × 100
- Direct methods: measurement from core flush by fluid or air.
- Indirect methods: well logging tools (density, neutron, and sonic)
What is oil well porosity?
Porosity refers to the tiny spaces within the rocks that house the oil and gas that must be extracted. To determine the porosity of the rock, a mathematical computation is used to conclude which percentage of the rock is taken up by the oil and gas versus the solid stone.
What is the effect of oil saturation on soap molar fraction?
As oil saturation is decreased (water saturation is increased), the acid content in the oil is decreased. Consequently, the soap molar fraction Xsoap is decreased, as Table 12.6 shows.
What is the saturation point of oil?
The saturation point is the maximum amount of dissolved water an oil will hold. It is dependent on temperature. As temperature increases, the saturation point of any given oil will decease at a relatively linear rate, as seen in the graph below.
What are sursurface oil saturation adjustments?
Surface oil saturations should be adjusted to compensate for shrinkage and bleedings [53 ]. Shrinkage is the term applied to the oil volume decrease caused by a temperature change or by a drop in pressure which causes dissolved gases to escape from solution.
How do you calculate residual oil saturation?
The residual oil saturation can be estimated using production data, reservoir rock and fluid data, material balance calculations and numerical simulation models (7). The amount of initial oil in place, N, is obtained by volumetric Eq. (1): (1)N=AhØS oi / B oi If only two fluids are present initially in the reservoir, S oi + S wi = 1, Eq.