Potentials Of Gas Depleted Reservoir For CO2 Storage Using Reservoir Saturation Tool (RST)

Ali J. Jani (N46037013)Yi-Ting Qiu Resources Engineering, NCKU

Potentials Of Gas Depleted Reservoir For CO2 Storage Using Reservoir Saturation Tool (RST)1OutlineA brief regarding RSTSegments & Components

Background Information

Data Acquired From YHS-6

Example2RST Brief Introductiondeveloped for Schlumberger

Pulsed neutron determination of reservoir saturation, porosity, and borehole fluid flow and three-phase holdup

Time lowdown, multifunctional, Accurate3Divice Segments 4

RST-C BackgroundTwo Types of Data are recorded using RST5Pulsed Neutron Capturing (PNC)Tools measure all gamma-rays above a minimum energy and record total count rate versus time

Pulsed Neutron Spectroscopy (PNS) Separate gamma-rays received during specified time bins into a spectrum of energies.

BackgroundRST Pulsed Neutron Capturing PNC6Source: SPE 159448 Formation raysBackgroundRST Pulsed Neutron Spectroscopy PNS7

Source: SPE 159448 BackgroundRatiosDetector Ratios (Near to Far)the Capture time difference of the same info (inelastic rays, Gamma ray), then weighted by statistics.

Location Ratios (Borehole to Formation)each detector captures borehole data during short burst, and formation during long one.

8BackgroundYHS-6 Provided Data9AppendixTerm Definition PurposeBSALBorehole Salinity Contrast SIBFSigma borehole fluidinterpretation of SIGMFormation Sigmahydrocarbon identifikation WINRWeighted inelastic rationUsed as Gas identificationTPHIThermal Decay Porosityinterpretation of Saturation CIRN_FILCapture to inelastic ratio near fitered CIRF_FILCapture to inelastic ratio far fitered IRAT_FILInelastic Ratio Filtered RSCNNear Detector ineffective unregulated capture count rateRSCFFar Detector ineffective unregulated capture count rateBackground BSALgives an idea on Hydrocarbon zones when it has high value, no good Sigma resolution when its low (SPE 30598)SIGM provides the hydrocarbon signature (Sw) much like a low conductivity reading on an electrical log two key environmental effects contribute to the observed decline, or decay rate: diffusion and the borehole contamination 10Background WINRFrom RST tool used as gas identifier

IRATFar to near detector ratio of inelastic count rates. Increases in gas and decreases with porosity11

where C1,C2 = constants

Background CIRN-FIL & CIRF-FILgives a ratio of capture to inelastic time for Near and Far detectors respectively, increasing detects hydrocarbons

RSCN & RSCFUnregulated Near and Far count rates12Background NPHINeutron Log determined Porosity 13Wehre

Data Acquired 14Log Interval

3438.60 m3243.00 mYHS-6 Provided Data

TD = 3438 m, (WHSLE = 44 m)Max Dev = 4 Investigated Interval = 3252 ~ 3287 m15

Maxwell Parameter Setting

Using SLB specified Maxwell parameters for in-tube Cased hole logging with various fluid propertiesData Acquired Data Acquired 16

Gas indication on separation

Increase when Gas detected

Example17

SandstoneExample18304533733451 Log Interval

3230 m2300 m2096YHS-6 Provided Data

Two different cap shales are covering the investigated zones ( & ) SandstoneThank You19