ABSTRACT:

Oil shale is a compact laminated rock of sedimentary origin containing organic matter known as kerogen. The steps involved for in-situ extraction process are hydrofracturing, injection to achieve communication, and fluid migration at the underground location. Therefore, it is very important to understand the physico-mechanical behaviour of such anisotropic rocks. The favourable characteristics of Assam coal for conversion to liquid fuels have been known for a long time. Studies have indicated that these coals and carbonaceous shale constitute the principal source rocks that have generated the hydrocarbons produced from the region. In the present work an attempt is made to understand the engineering behavior of Indian oil shales experimentally. The in situ coring is performed to get the samples for testing purposes, as coring in laboratory is very difficult due to its highly anisotropic nature. Different tests are performed to understand the petrology of these samples, further the chemical analyses are also done to exactly quantify the organic and inorganic contents in these rocks. The physical and mechanical properties of these rocks are investigated by considering different anisotropic angles. Further, the petrophysical test results are correlated with the mechanical properties. These properties and correlations will further help in increasing the yield of these rocks.

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