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Download Simple Seismics: for the petroleum geologist, the reservoir by N.A. Anstey PDF

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By N.A. Anstey

This little publication is various. it's written, essentially, for geologists, reservoir engineers, and log analysts. Why? simply because cutting-edge seismic procedure is greater than a device for reconnaissance exploration, for locating constructions; it has develop into a device for learning the stumbled on reservoir-its quantity, its boundaries, its diversifications of thickness, and its tendencies of porosity. at the present time, the geophysicist, the geolog­ ist, the engineer, and the log analyst can do good stuff jointly. as the ebook isn't written basically for geophysi­ cists, it could bypass a lot of the "mechanics" of the seismic strategy. The reader who reaches the final web page (bless him!) won't be able to instruction the seismic procedure, yet he'll know how the seismic process might help to resolve his difficulties. it can even be of price to these practitioners of the seismic method-in the sphere or within the processing centre-who already recognize the mechanics of the strategy, yet want to take a broader view. 1 1 Seismics and constitution Of the entire geophysical equipment operating from the skin, there's just one that's greatly authorized for reports of person petroleum reservoirs-the seismic mirrored image process. we'd dearly like to have whatever larger, yet lamentably ... decreased to its necessities, the strategy is that this: we make a bang, and we hear for echoes.

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Extra info for Simple Seismics: for the petroleum geologist, the reservoir engineer, the well-log analyst, the processing technician, and the man in the field

Example text

The importance of this is that we have a copious source of coarsegrained sedimentary materials. At (b) we see another body without internal reflectionsin fact its outline can be seen only as a break in the reflections each side. From the draping of sediments over it we know it is relatively incompactible; from its position we conclude it is a reef. From that, we interpret (c) as lime-rich fore-reef material and (d) as back-reef materials. At this stage we know nothing about the reservoir properties.

These efforts are critical to the advancement of rockproperty analysis from seismics. We see, then, the best that the classical seismic method can hope to provide in this context: reservoir extent, reservoir thickness, reservoir porosity, and the position of the gas-liquid contact. Oil-water contacts are not generally visible, and we see no hope of a seismic measure of permeability. With these objectives and hopes established, we must spend a little time understanding the barriers to their fulfillment and the errors to which they are subject.

From Sangree and Widmier; courtesy AAPG) ~ :: a )( ~ 0( w ... '" iii ~ ... OJ ... IL ... li Z ;; '" < Sl-_ SW (1) "'I ~ ~ 'ti ~ ..... ctQ. ~ Ci) ..... ~ E. ~. ~ 1;;. Ci) 28 Simple Seismics • Reflections of high amplitude but only local continuity in an onlap relation to an unconformity are likely to be marginal-marine sands or carbonates deposited during alternating high- and low-energy episodes. If the onlap relationship is actually seen at high amplitude, units of significant thickness are likely (Figure 16).

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