Active time-lapse seismic is widely employed for monitoring CO2 geosequestration due to its ability track the distribution of fluids in space and time. However, standard 4D suffers from several challenges, including high cost, disruption other land uses, and, consequently, relatively large intervals between monitor surveys. Some these challenges can be mitigated using permanently installed sour...

Time-lapse seismic data acquisition is an essential tool to monitor changes in a reservoir due fluid injection, such as CO 2 injection. By acquiring multiple surveys the exact same location, authors can identify by analyzing difference data. However, analysis be skewed near-surface seasonal velocity variations, inaccuracy, and repeatability parameters, other inevitable noise. The common practic...

This study focuses on measurements of clastic rocks ranging from 3 Hz up to 500 kHz in the laboratory and their application to well log analysis and a time-lapse study in the North Sea. Measurements of elastic properties over a large frequency spectrum can provide a better understanding of the dispersion and attenuation mechanisms in rocks and help to predict and model these effects. Sandstones...

Abstract The Ozifa reservoir is proven that cuts across the Northern and Greater Ughelli depo-belts of Niger Delta Basin. This possesses heterogenous character southward field, making elastic properties, lithologies fluid types difficult to describe accurately. In this study, rock physics template was applied porosity acoustic impedance (AI) crossplot clusters illustrate rock–fluid relationship...

For a robust way of estimating time shifts near horizontal boreholes, we have developed a method for separating the reflection responses above and below a horizontal borehole. Together with the surface reflection data, the method uses the direct arrivals from borehole data in the Marchenko method. The first step is to retrieve the focusing functions and the updown wavefields at the borehole lev...

Recent studies have inferred the feasibility of time-lapse controlled-source electromagnetic (CSEM) methods for the surveillance of offshore oil and gas fields. However, quantitative interpretations have not been shown to ascertain what information about the reservoirs that may be recovered. We present a 3D inversion study of synthetic time-lapse CSEM data for the lateral water flooding of a re...