Utilizing Integrated Prediction Error Filter Analysis (INPEFA) to divide base-level cycle of fan-deltas: A case study of the Triassic Baikouquan Formation in Mabei Slope Area, Mahu Depression, Junggar Basin, China
| Autor: | Rui Yuan, Jun Wu, Yuanquan (Nancy) Zhou, Xincai You, Yuqiu Sun, Jianhua Qu, Rui Zhu |
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| Rok vydání: | 2018 |
| Předmět: |
QE1-996.5
fandelta integrated prediction error filter analysis Mean squared prediction error Geology 020206 networking & telecommunications 02 engineering and technology base-level cycle Environmental Science (miscellaneous) Structural basin 010502 geochemistry & geophysics 01 natural sciences Filter analysis baikouquan formation Depression (economics) 0202 electrical engineering electronic engineering information engineering General Earth and Planetary Sciences mahu depression China Base (exponentiation) Geomorphology 0105 earth and related environmental sciences |
| Zdroj: | Open Geosciences, Vol 10, Iss 1, Pp 79-86 (2018) |
| ISSN: | 2391-5447 |
| DOI: | 10.1515/geo-2018-0007 |
| Popis: | The Mahu Depression is an important hydrocarbon-bearing foreland sag located at the northwestern margin of the Junggar Basin, China. On the northern slope of the depression, large coarse-grained proximal fan-delta depositional systems developed in the Lower Triassic Baikouquan Formation (T1b). Some lithologic hydrocarbon reservoirs have been found in the conglomerates of the formation since recent years. However, the rapid vertical and horizontal lithology variations make it is difficult to divide the base-level cycle of the formation using the conventional methods. Spectral analysis technologies, such as Integrated Prediction Error Filter Analysis (INPEFA), provide another effective way to overcome this difficultly. In this paper, processed by INPEFA, conventional resistivity logs are utilized to study the base-level cycle of the fan-delta depositional systems. The negative trend of the INPEFA curve indicates the base-level fall semi-cycles, adversely, positive trend suggests the rise semi-cycles. Base-level cycles of Baikouquan Formation are divided in single and correlation wells. One long-term base-level rise semi-cycle, including three medium-term base-level cycles, is identified overall the Baikouquan Formation. The medium-term base-level cycles are characterized as rise semi-cycles mainly in the fan-delta plain, symmetric cycles in the fan-delta front and fall semi-cycles mainly in the pro-fan-delta. The short-term base-level rise semi-cycles most developed in the braided channels, sub-aqueous distributary channels and sheet sands. While, the interdistributary bays and pro-fan-delta mud indicate short-term base-level fall semi-cycles. Finally, based on the method of INPEFA, sequence filling model of Baikouquan formation is established. |
| Databáze: | OpenAIRE |
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