The Intensive Description Of The Complex Lithology Of Chaluhe Rift Valley And Its Influence To The Logging Curve

The lithology of rift valley is very complex, the great change of the mineralization cross the area lead to the complex of the electrics the oil, gas and water reservoir which will interrpt the precision of the liquid of the distinguishing. The composition of the mineral, structure and texture of the lithology are different in different facial zone or different lithology. In addition, the shotage of the testing data have agreat influence to distinguishing the electric character of oil-gas-water reservoir.It would recognize the performance of electric chatacter the only if its relationship of"four-character"were well known.We collected, summarized, referred and analysed the achievement of others, appraised the former studies, void to do the useless work.In microcosmic, we observed the core of 15 wells, especially we studied the component of the mineral in complex lithology reservoir. And identify the element and the component the gravel and the lithology, further studied the stuff in grains framework, studied the component and structure of the stuff intensively, pay attention to the absolute content of the impurities, especially focus on the absolute content of the clay mineral. In macro-geology, contrasted and classified the complex lithology reservoir under the same the conditions (the same stratum, the same the sediment zone,the same sediment lithology)according the law of the geology(the law of revolution of the sedimention). Meanwhile, connect the logging and geology, further micro-geology description and took the lithology-physics experiment. We set up the explanation geo-model of the complex lithology reservoir, improved the oil-water distinguishing rate. But because the different logging device and different logging series so the data could not contrast together, the correction and standardization of the logging data and is necessary. The most old well is loggen by domestic logging series in this area,include SP, GR, R2.5, LLD, LLS, AC, CAL etc. The GR curve unit is ununiformed so the GR logging effect is unprecise. The Sp logging effect is unprecise due to the great change of the mineralization in stratum water. So we take the AC-RT intersection graphic to distinguish the lithology. The AC-RT intersection graphic can identify the oil reservoir and water reservoir. We summarized the 4 oil stratum AC-Rt intersection model after analysed the 89 stratum in 21well to provide the foundation for the new oil stratum testing.Giving the amending appraisal to the old logging data, form the exact improving policy, ehanced the old potential oil-test tratum.