A NEW CALCULATION METHOD FOR HYDROCARBON GENERATION AND DISCHARGE AMOUNT IN GEOCHEMICAL LOGGING

By comprehensive consideration over the effect of diagenetic compaction and organic matter thermalevolution and types,a new organic carbon recovery model is established in this paper on the principle thatthe absolute content of unavailable carbon in kerogen remains constant in the pr0cess 0f hydrocarbon generation. On this basis, a calculation formula about hydrocarbon generation and discharge amount fit for geochemical logging is obtained to make the whole calculation process more correct and efficient than for mer illustration method. This new method has been applied successfully in geochemical logging to the offshore, subaerial and peripheral basins of the Liaohe Oil Field. In this paper, only one well in the TielingBasin is taken for example to explain the application of this method.The geochemical log of Dichang 2 well in the Tieling Basin shows that its hydrocarbon generation intensity is 263. 794×10⁴t/km²,its hydrocarbon discharge intensity is 138. 166×10⁴t/km² and its resource density is 13. 190×10⁴t/km². All these have come up to the hydrocarbon-generating intensity standard for Ⅰ-typed oil and gas basins of our country.The Changtu Depression has more sufficient source of oil and gas, and is hoped to form some middle and small scale of oil and gas fields. The next exploration program is mainly to find traps and favorable reservoirs.