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With oil-generating formations in the Dongying basin as the objective of study,thispaper deals with the relations among petroporphyrins,lithology,oxidation-redaction condi-tions,maturation and conversion of organic matter,and burial depth.It is considered thatthe content of petroporphyrins in the oil-generating formations depends on the quantity andnature of organic matter,sediment ary environment and burial depth.There is a porphyrin-richinterval at 2,200—2,700 m with the corresponding geothermal temperature ranging from 93° to119℃.It is also an oil-accumulating zone.Nickel in the crude or in the nucleus of petro-porphyrin is accumulated during the process of oil generation.Nickel-porphyrin abundance inthe oil-generating formations has a negative correlation with the content ef nickel.Evaluationof the oil-generating formations bae been made on the bosis of petroporphyrin data.
With oil-generating formations in the Dongying basin as the objective of study, this paper deals with the relations among petroporphyrins, lithology, oxidation-redaction condi-tions, maturation and conversion of organic matter, and burial depth. It is considered that the content of petroporphyrins in the oil-generating formations depends on the quantity and nature of organic matter, sediment ary environment and burial depth. Here is a porphyrin-rich interval at 2,200-2,700 m with the corresponding geothermal temperature ranging from 93 ° to 119 ° C.It is also an oil -accumulating zone. Nickel in the crude or in the nucleus of petro-porphyrin is accumulated during the process of oil generation. Nickel-porphyrin abundance inthe oil-generating formations has a negative correlation with the content ef nickel. Evaluation of the oil-generating formations bae been made on the bosis of petroporphyrin data.