Comprehensive Guide to Thickness and Depth Calculation in Oil Exploration

1. ضخامت و ژرفا www.oilexploration.ir

2. True thickness t,apparent thickness t’, outcropwidth w and depth d. ضخامت و ژرفا

3. t = w sin δ. w = l sin β, t = l sin β sin δ. ضخامت واقعی Thickness from horizontal, strike-normal traverse of length w: (a) map; (b) strike-normal section.

4. t = w sin(σ − δ). • t = w sin σ. • t = w sin(δ + σ). • t = w. • t = w sin [180 − (δ + σ)] = w sin(δ + σ). • t = w sin(90 − σ) = w sin(90 + σ). • t = w sin(δ − σ). • In general: • 1. If the slope and dip are in opposite directions the sum (δ + σ) is used. • 2. If the slope and dip are in the same direction the difference (δ−σ) or (σ −δ) is used. ضخامت واقعی

5. t1 = h sin δ and t2 = v cos δ. There are two main cases. 1. If the slope and dip are in opposite directions then t = (t1 + t2) (Fig. a). 2. If the slope and dip are in the same directions the total thickness is the difference of the two partial thicknesses. There are two subcases: (a) If (δ < σ) then t = (t1 − t2) (Fig. b). (b) If (δ > σ) then t = (t2 − t1) (Fig. c). In total t = |h sin δ ± v cos δ|. بدست آوردن ضخامت واقعی از طریق مولفه‌های افقی و عمودی

6. ضخامت در چاه حفاری شده Thickness in inclined drill hole: (a) down-dip drift; (b) up-dip drift. Thickness in vertical drill hole. t = t’m cos(δ + ψ) for down-dip drift t = t’m cos |δ − ψ|for up-dip drift t = t’m cos |δ ± ψ| in total t = t’v cos δ,

7. عمق یک صفحه Depth: (a) map; (b) strike-normal section; (c) oblique section. d = mtan δ و d = l tan α بنابر این d = l sin β tan δ.

8. عمق یک صفحه در یک منطقه شیب‌دار Depth: (a) slope and dip in opposite directions; (b) slope and dip in same direction.

9. عمق یک صفحه در یک منطقه شیب‌دار Depth: (a) slope and dip in opposite directions; (b) slope and dip in same direction. When slope and dip are in opposite directions (Fig. a). d2 = h tan δ and d1 = msin σ. Because h = mcos σ and the total depth d = (d1 + d2) we then have d = m(cos σ tan δ + sin σ). If the slope and dip are in the same direction and (δ > σ) (Fig. b), the total depth d = (d1 − d2). Then d = m(cos σ tan δ − sin σ). If (δ < σ) then “depth” is measured upward, as might occur in a mine. This will be signaled by −d. When the measurements are made oblique to the strike, can be written in terms of the traverse length and the apparent dip d = l|cos σ tan α ± sin σ|, since tan α = tan δ sin β then d = l|cos σ tan δ sin β ± sin σ|.