Abstract
Can accurate density and porosity be determined for important drillhole intervals where conventional well logs perform poorly, where old casings shield rocks from standard evaluation methods, or where irregularly distributed porosity (e.g., fracture or vugular porosity) defies conventional assessment? Can porous zones not penetrated by the drill but within production distances of the well be detected? Can the extent or proximity of subsurface structural features or stratigraphic units be determined from borehole measurements? Under what conditions are these achievable goals of a borehole gravity (BHG) survey? Can repeated surveys made during the lifetime of a petroleum reservoir provide useful information about reservoir mass changes? What information can be extracted from the integrated analysis of BHG data, conventional well logs, and other geophysical and geological information? What are the limitations of BHG surveys?
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