OIL AND GASES OF THE KRASNOLENINSKY FIELD AND THE SEARCHING FOR THEIR SOURCE ROCKS (WESTERN SIBERIA, RUSSIA)

Summary The main purpose of the work was to search for source rocks that formed oil and gas deposits in the Jurassic section of the Krasnoleninsky field. Using GC, GC–MS, GC–MS/MS, IR-MS and Rock-Eval methods we studied 163 samples of oils, 144 gases and 1000 source rocks and reservoirs from the wells of this field. According to our results, the most significant source of hydrocarbons are rocks of the Bazhenov Horizon (Tutleim Formation). We allocated one large source of hydrocarbon generation within the Krasnoleninsky field, where rocks of the Bazhenov Horizon have released their source potential from 0 to 84%. The largest realization of source potential has occurred on the territory of Kamennaya, Palyanovskaya and Em-Egovskaya areas. The second most important source rock of hydrocarbons located in the complex of the Lower Middle Jurassic rocks with a high content of organic matter. these rocks contain typical non-marine organic matter, which accumulation proceeded mainly under oxidizing conditions. According to the complex of molecular and isotopic characteristics, we estimated the contribution of fluids generated by different types of source rocks.