Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1978-06-14
1981-02-17
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324367, 324374, G01V 318, G01V 324
Patent
active
042517737
ABSTRACT:
Method and apparatus are disclosed for investigating lateral characteristics of an earth formation penetrated by a borehole. Substantially identical measurement transducers are mounted in a fixed separation, side-by-side relationship on a pad adapted for sidewall application. As a pad traverses the borehole, measurement signals are produced corresponding to the same formation investigation conducted along two side-by-side paths on the borehole wall. The signals are recorded and provide an indication of lateral changes between the side-by-side paths. By comparing the signals with varying depth displacements, the best likeness and corresponding displacement are determined and provided as an indication of lateral inclination of the formation. The best likeness indicates a lateral formation homogeneity characteristic and the displacement the inclination of the lateral characteristic between the side-by-side paths. In a multipad embodiment, the lateral characteristic determination is made for each pair of side-by-side paths around the borehole and combined to provide the dip of lateral characteristics which persist to some degree around the borehole. When side-by-side transducer pads are employed on conventional dipmeters, twice as many dipmeter signals are produced, allowing more detailed correlation of signal features corresponding to vertical changes in formation characteristics, such as occur between bed boundaries, and thus improves the formation dip determination.
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Cailliau Michel
Vincent Philippe
Borst Stephen L.
Schlumberger Technology Corporation
Strecker Gerard R.
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