Ordos Basin, Dingbian Brick Well Block, Chang 7 Member: High-resolution Sequence Stratigraphic Division Using INPEFA

Yongfeng Niu; Xin Hui; Ji Han

doi:10.54097/cs0rfp49

Authors

Yongfeng Niu Shale Oil Production and Construction Project Headquarters, Yanchang Oilfield Company Limited, Yan'an, Shaanxi 716000, China
Xin Hui Shale Oil Production and Construction Project Headquarters, Yanchang Oilfield Company Limited, Yan'an, Shaanxi 716000, China
Ji Han Shale Oil Production and Construction Project Headquarters, Yanchang Oilfield Company Limited, Yan'an, Shaanxi 716000, China

DOI:

https://doi.org/10.54097/cs0rfp49

Keywords:

Chang 7 oil-bearing formation; Dingbian Brick Well Block; INPEFA curve; high-resolution sequence stratigraphy.

Abstract

The tuff marker bed of Chang 7 Member of Yanchang Formation in the Ordos Basin is superimposed in multiple periods, and the shale layer system has significant time-crossing filling characteristics. There is great uncertainty in the isochronous comparison of the sub-members of the traditional lithostratigraphic method. Based on the natural gamma logging curve of drilling in Dingbianzhuan well block, the comprehensive prediction error filtering analysis ( INPEFA ) technology is used, supplemented by the constraint of tuff marker layer, and the high-resolution sequence division is carried out for the sub-members of Chang 7₁, Chang 7₂and Chang 73. The results show that the Chang 7 oil layer group belongs to a long-term base level descending half cycle as a whole, and two fourth-order sequences can be divided inside. The lower fourth-order sequence consists of a complete symmetrical cycle composed of the Chang 7₃ progradational sequence group and the Chang 7₂ regressive sequence group, with the maximum regressive surface located in the interior of Chang 7₂. The upper fourth-order sequence corresponds to Chang 7₁, and only the ascending half cycle is retained. The fifth-order sequence is divided into : 1 progradational parasequence developed in Chang 7₃, 2 parasequence developed in Chang 7₂, and 2 regressive parasequence developed in Chang 7₁. The INPEFA trend curve quantitatively reveals differences in cyclic structure among the three sub-members: a continuous negative trend in Chang 7₃ indicates progradation, with a positive trend shift at the top marking the terminal flooding surface; in Chang 7₂, the lower part continues the negative trend while the upper part shifts to positive, with the minimum at the trend transition pinpointing the maximum regressive surface; Chang 7₁ is dominated by a positive trend, with stepwise rise interrupted by two negative deflections, each corresponding to two brief provenance progradation events during the lake transgression. Sequence boundaries at all levels can be traced and correlated across the study area. This division scheme provides a quantitative basis for isochronous stratigraphic correlation in deep-water fine-grained sedimentary areas that does not rely on static lithological boundaries.

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