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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Chapter 4: Method for Characterizing Source Rock Organofacies Using Bulk Rock Composition
Abstract
We present a straightforward and effective method to predict source rock organofacies using basic compositional data and a ternary discriminant plot prior to the availability of suitable pyrolysis data. Associating compositional data with organofacies can tie into previously correlated depositional environments and expulsed hydrocarbon types. Using this methodology to preliminarily establish organofacies can help classify source rocks and reduce the practice of comparing source rock plays based solely on production characteristics.
Four basic source rock affinities have been noted: (1) clay-quartz affinity with minor carbonate, (2) clay-quartz affinity with carbonate, (3) carbonate affinity, and (4) bimodal clustering and affinities. Trends in the compositional data can also aid in the prediction of lateral and vertical changes in depositional systems and help ascertain the presence or absence of specific organofacies in an area. Each source rock may have multiple organofacies, and these can vary within or between basins. Ternary plots also distinguish the relative brittleness of lithofacies and, therefore, more suitable unconventional reservoirs. This technique does not directly indicate quality of the source rock; standard geochemical analyses are still needed to identify high-quality source rocks.
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