South Elton Field, located in Jefferson Davis Parish, Louisiana, consists of complex stratigraphic and structural components. As is the case with many of oil and gas fields located in southern Louisiana, interpreting the subsurface can be difficult due to these features. The most common structural components affecting these areas consist of massive growth fault systems. Growth faults can cause immense variations in bed thicknesses that in turn can lead to many difficulties when interpreting and correlating well logs. Therefore, using only well logs in these areas can sometimes be problematic. However, using well log and seismic data together can greatly improve the accuracy of any subsurface interpretation. Unfortunately, seismic signal responses can also be greatly affected by subsurface variations. This can alter the accuracy of any interpretation even when using tools such as well logs and seismic data. In this area of southern Louisiana, a major unconformity exists that marks the bottom of the Hackberry sequence (a predominately marine shale wedge) called the pre-Hackberry unconformity. This unconformity causes multiple difficulties when interpreting the seismic data below it, especially within the predominant reservoir in this field, called the Homeseekers Sequence. Fortunately, seismic data can be manipulated to help better visualize certain aspects of the seismic responses. One way of doing this is to calculate instantaneous seismic attributes. Seismic attributes such as these can aid the standard amplitude attribute by highlighting packages of seismic events, which in turn can help to map a specific horizon that correlates to a hydrocarbon reservoir of interest. The use of instantaneous seismic attributes and well control over the area allowed for an improved representation of the subsurface in South Elton Field and, most importantly, the Homeseekers reservoir assemblage existing beneath the pre-Hackberry unconformity.
|Commitee:||Gottardi, Raphael, Kinsland, Gary|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 58/05M(E), Masters Abstracts International|
|Subjects:||Geology, Petroleum Geology|
|Keywords:||Faulting, Frio Formation, Instantaneous seismic attributes, Pre-Hackberry unconformity, South Elton Field, Subsurface geology|
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