| Author's Name: Wang Kun, Liu Wei, Huang Qingyu, Shi Shuyuan, Wang Ping, Zhang Yanqiu |
| Institution: PetroChina Research Institute of Petroleum Exploration &Development |
| Abstract: |
| Cambrian outcrops are rare in distribution in Tarim Basin and only a few drilled wells penetrated through the whole Cambrian strata. These facts make difficulty for geologists to carry out the study of basin-scaled stratigraphic sequence. On the base of the data from outcrops at Xiaoerbulake, a detailed analysis of stratigraphic sequence framework was conducted according to the lithofacies characteristics and their stacking patterns. The Cambrian strata consists of 8 Ⅲ-order sequences and 18 Ⅳ-order sequences. The lithologic sections of wells obtained by geological logging are low in accuracy, which can′t meet the requirement of sequence division. Based on the Fisher discriminant analysis, wells were conducted on the lithology identification with core data and well logging data. Depending on the Maximum Entropy Spectrum analysis of the GR curves, changing trends of the shale content in carbonate rocks within wells were analyzed. Seismic data were also used to identify the sequence boundary. The data from 10 wells and 1 outcrop that are representative to the W-E and N-S profiles across the basin were conducted on sequence division under constraint of multiple data. Combined with wells and outcrop division, 2 sections of high-frequency sequence were correlated. It is concluded that, the depositing rate generally increased during Cambrian period, and depocenter migrated toward Tadong region. Different types of reservoirs occur in different sequence types. Sequence boundaries are favourable for developing good reservoirs. |
| Keywords: Cambrian; Sequence stratigraph; Sequence correlation; Lithofacies; Reservoir; Tarim Basin |
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投稿时间：
2015-02-16 |
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