Quantitative prediction of deep effective sandstone reservoir in geomorphologic and tectonic complicated area: An example from Bashenjiqike Formation of Middle Qiulitage Area in Tarim Basin
XU Zhaohui1, XU Zhenping2, ZHANG Ronghu3, WANG Lu1, HU Zaiyuan4, QIN Lianbin5
1. Research Institute of Petroleum Exploration&Development, PetroChina, Beijing 100083, China; 2. Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China; 3. PetroChina Hangzhou Research Institute of Geology, Hangzhou, Zhejiang 310023, China; 4. Northwest Branch, Research Institute of Petroleum Exploration&Development, Lanzhou, Pe-troChina, Gansu 730020, China; 5. Xinjiang Tadong Oil and Gas Exploration and Development Co., Ltd, Daqing Oilfield Company, PetroChina, Korla, Xinjiang 841000, China
Abstract：The high and steep "blade mountain" topography in the Middle Qiulitage Area makes it difficult to acquire and process seismic data. The complex subsurface structure of the foreland thrust belt leads to poor seismic imaging and low signal-to-noise ratios. The above-mentioned "dual complexity" situation has caused a strong ambiguity in seismic interpretation and many interference factors in the prediction of sedimentary reservoirs. To this end, on the basis of the newly processed post-stack depth-domain 3D seismic and drilling/logging data, we use seismic sedimentology to qualitatively restore the distribution and evolution of lithofacies in three fault walls, respectively. The principal component analysis is utilized to convert seismic attributes into principal components. Through the fitting of the accumulated thickness of the effective reservoir (porosity>6%) measured at well points, the effective reservoir thickness of the target interval is calculated. Then main controlling factors of effective reservoir distribution are discussed. The following conclusions were obtained:①The target interval is dominated by medium-thick sandstone, showing low frequency on the blended profile and high frequency in a small amount of thin sandstone or mudstone. ②On the large-area distribution of sandstone, the lateral distribution of effective reservoirs is heterogeneous, in which the hanging wall has good continuity and large thickness (50~65m); the middle wall has poor continuity with thickness of 45~75m; the effective reservoir of the foot wall has medium continuity and small thickness (50~60m). ③Lithofacies is the main factor that controls the lateral continuity and thickness of effective reservoirs, and the northeast-southwest trending faults also regulate the distribution of effective reservoirs. In this paper, the application scope of seismic sedimentology is extended from the shallow layers in areas with simple structures to deep layers in the "dual complexity", namely surface and subsurface areas. The paper also provides a reference for effective reservoir prediction in areas with similar geologic backgrounds.
徐兆辉, 徐振平, 张荣虎, 王露, 胡再元, 秦连彬. 表腹双复杂构造区深层砂岩有效储层定量预测——以塔里木盆地中秋里塔格地区巴什基奇克组为例[J]. 石油地球物理勘探, 2022, 57(1): 194-205.
XU Zhaohui, XU Zhenping, ZHANG Ronghu, WANG Lu, HU Zaiyuan, QIN Lianbin. Quantitative prediction of deep effective sandstone reservoir in geomorphologic and tectonic complicated area: An example from Bashenjiqike Formation of Middle Qiulitage Area in Tarim Basin. Oil Geophysical Prospecting, 2022, 57(1): 194-205.
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