Hydrocarbon-generation-induced microcracking of source rocks definition

Petroleum source rock is defined as the finegrained sediment with sufficient amount of organic matter, which can generate and release enough hydrocarbons to form a commercial accumulation of oil or gas. Since the source rock has a layered structure, the best forward model is a. We have investigated the effects of organic content and maturation on the elastic properties of source rock shales, mainly through integration of a well. Petroleum geoscience oilgas transformation induced.

They form one of the necessary elements of a working petroleum system. In petroleum geology, source rock refers to rocks from which hydrocarbons have been generated or are capable of being generated. Diadromous fish populations in the pacific northwest face challenges along their migratory routes from. The depth of hydrocarbon generation and the yield of individual hydrocarbon phases are primarily a function of the kinetics of the kerogenhydrocarbon conversion.

Orthotropic inversion uses azimuthally sectored seismic data stacked, based on incident angle ranges. Geological survey bibliography of welllog applications cumulative edition. The organic content of petroleum source rock layers can be determined from seismic data with a suitable avo technique. Some argue that shale gas has already proved to be a game changer in the u. Nov 01, 2016 shales are ubiquitous rocks in sedimentary basins, where their low permeability makes them efficient seals for conventional oil and gas reservoirs and underground waste storage repositories waste waters, co2, nuclear fuels. Concretion morphology, classification and genesis sciencedirect. They are organicrich sediments that may have been deposited in a variety of environments including deep water marine, lacustrine and deltaic. The inversion is based on the effective medium theory. Dynamic mechanical properties and anisotropy of synthetic. Burial history and catalytic effects, due to source rock matrix chemistry, affect the rate of generation, although these effects are secondary to the kinetic effects figure 1 shows hydrocarbon generation vs.

In agreement with published petrographic observations, these microcracks significantly. Fred schroeder, retired from exxonexxonmobil presented on july, 2017. Secondary migration is the movement of petroleum outside of the source rock and into a reservoir bed. The organic content of petroleum sourcerock layers can be determined from seismic data with a suitable avo technique. Modeling maturation, elastic, and geomechanical properties. Microfracturing and microporosity in shales, earthscience. The strong elastic anisotropy of tight, thermally mature source rocks is further enhanced by overpressureinduced beddingsubparallel microcrack development during the main stage of hydrocarbon hc generation and primary migration at r o greater than 0. You may not copy or adapt this publication without first obtaining permission. The presence of clay minerals can alter the elastic behaviour of reservoir rocks significantly as the type of clay minerals, their volume and distribu. Shale gas source rocks are widely distributed around the world and many countries have now started to investigate their shale gas potential. Both p and swave velocities in different directions increase with the applied differential pressure in all samples, as shown in tables 25. Finally, petroleum migrates out of the source rock, pressures decline, especially if the petroleum migrates vertically. A petroleum source rock is defined as any rock that has the capability to generate. Hydrocarbon generationinduced microcracking of source rocks.

Determination of shale stiffness tensor from standard logs. Hydrocarbon generationinduced microcracking of source. Moreover, when they contain organic matter, they form source rocks for hydrocarbons that may escape towards a more porous. Shales are ubiquitous rocks in sedimentary basins, where their low permeability makes them efficient seals for conventional oil and gas reservoirs and underground waste storage repositories waste waters, co2, nuclear fuels. Western siberia hydrocarbon exploration spectral density. Petroleum geoscience oilgas transformation induced fracture. Finally, we quantified the velocity and mechanical anisotropy based on the definition of thomsen. To investigate primary petroleum migration through microfracturing of source rocks, we develop a theoretical multiphysics model incorporating simultaneous generation of oil and gas from kerogen, elastic anisotropy of the source rock and propagation of microcracks filled with oil and gas. Even for highfold acquisition, this azimuthangle grouping can result in lowfold angle stacks. Source rocks are commonly shales and lime mudstones, which contain significant amount of organic matter. Hydrocarbongenerationinduced microcracking of source rocks. Determination of shale stiffness tensor from standard logs determination of shale stiffness tensor from standard logs chesnokov, evgeni. Contact the bgs intellectual property rights section, british geological survey, keyworth, email email protected you may quote extracts of a reasonable length without prior permission, provided a full acknowledgement is given of the source of the extract. A discussion of the most relevant morphological features of concretionary bodies and the different classifications, and the criteria involved in these classifications is presented, together with suggestions for improvements to the various classification schemes.

Moreover, when they contain organic matter, they form source rocks for hydrocarbons that may escape towards a more porous reservoir during burial, a process referred to. The measured velocities along three directions are summarized in tables 2 5. Since the source rock has a layered structure, the. The testing of the technique on laboratory measurements of the elastic wave velocities in shale samples shows that the inversion makes it possible to predict the elastic wave. From oilprone source rocks to gasproducing shale reservoirgeologic and petrophysical. A source rock is a rock that is capable of generating or that has generated movable quantities of hydrocarbons the first factor to be assessed in an exploration play in an area yet to be drilled is whether a source rock is present. Modeling maturation, elastic, and geomechanical properties of. After migration the pressure decreases and the fractures and pores close. Hydrocarbon generation induced microcracking of source rocks. The strong elastic anisotropy of tight, thermally mature source rocks is further enhanced by overpressureinduced beddingsubparallel microcrack development during the main stage of hydrocarbon. Nov 01, 2010 abstract a technique allowing inversion of the shale stiffness tensor from standard logging data. Petroleum source rocks characterization and hydrocarbon.