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Reservoir architecture of turbidity channels in the 5th area of Bonan Oilfield
LI Zhipeng1, YANG Yong1, HOU Jiagen2, GUO Yingchun1
(1.Research Institute of Exploration and Development, Shengli Oilfield, SINOPEC, Dongying 257061, China;2.School of Geosciences in China University of Petroleum, Beijing 102249, China)
Abstract:
Based on the dispositional model of turbidity channel, we established a reservoir architecture model of turbidity channels. We studied the reservoir architecture of the turbidity channels in the 9th sand group of E2s3 in Bonan Oilfield using the rock cores, outcrop, logging and the well pattern of the well sections. The results reveal that there are six types of lithofacies in the turbidity channels. The lithofacies forms are the complete or incomplete Bouma Sequence. The monosandbodies are divided into two river systems by the ancient landform. Vertically the monosandbodies are in apart form and shallow erosion form. In the horizontal plane, the monosandbodies are in intersecting flaky form, intersecting banded form and isolated banded form. The single channel sand bodies are mostly 5-10 m thick; the channel widths are 400-800 m, with a 570 m average. There are muddy interlayer, calcareous interlayer and physical interlayer. The interlayers between the monosandbodies are stable and in good continuity. On the other hand the interlayers in the single channel sand body are less and unstable. The dip angle of the interlayers in the single channel sand bodies is small.
Key words:  turbidity sand  turbidity channel  reservoir architecture  interlayer  Bonan Oilfield