ZHANG Longhai; DAI Dajing; ZHOU Mingshun; QIAO Dexin; NING Congqian and LI Chaoliu
, 2006, 33(1): 1237-0.
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The sand bodies in lake basins are of small size, irregular distribution and strong heterogeneity, and the imaging logs with high resolution, large coverage and fine visualizability are required to study such reservoirs. The main applications of imaging logs in the study of lake basin sedimentations include the following. The imaging logs were used to verify the reliability of rhythmicity indicated by the shapes of conventional logs, which shows that it is reliable to use the bell-shaped and box-shaped logs to indicate the positive rhythm, while the reliability of using the egg-shaped logs to represent the positive rhythm is not so good, and the funnel-shaped logs do not necessarily correspond to the negative rhythm. The imaging logs can be employed to identify facies marker, most of the facies markers can be identified by using imaging logs except for the colors of rocks. The imaging logs can be applied in determining sand body frames, in the rocks of the sub-facies of the braided river delta front in H Oilfield, the analysis based on the imaging and conventional logs shows that the number and thickness of the positive rhythms are much bigger than that of the negative rhythms, leading to the conclusion that the main sand bodies are of the under-water distributary channel, not of mouth bar. Sedimentary characteristics from the calibrated imaging logs can also be used to accurately identify lithology, rock combination, and sedimentary sequences, and correct the cutting logs in complex formations, hence recover the correct lithological profile and sedimentary environment.