ANALYSIS OF ROCK PHYSICAL CHARACTERISTICS OF PERMIAN DEEP IGNEOUS ROCKS IN NORTHERN TARIM BASIN AND APPLICATION OF WELL LEAKAGE
Pengfei Kang1, Yongzhong Xu2, Haijun Yang1, Ruidong Liu1, Chong Sun1, Ping Yuan1, Mingjun Zheng1, Yongcan Peng1, Juntao LIU3,В
1 Institute of China Petroleum Tarim Oilfield Company, Korla, China
2 School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, China
3 School of Nuclear Science and Technology, Lanzhou University, Lanzhou, China
Ключевые слова: Igneous rock, Rock physical analysis, Well leakage analysis, Aman Transition Zone
Аннотация
The H working area is the main production block in Ordovician of the Tarim Basin Oilfield. However, the lithology and velocity of the Permian igneous rocks change drastically, and the lithology changes of the igneous rocks will affect the drilling progress. Different igneous rocks have different possibilities for leakage during drilling. Therefore, it is imperative to expand research on the velocity field of Permian igneous rocks. To begin with, a petrophysical analysis was conducted on 12 rock samples from the igneous formations in this area. These samples were analyzed for physical properties such as density, P-wave and S-waves velocity, Poisson's ratio, Young's modulus, and bulk modulus, under water-saturated conditions. By combining these findings with previous data from 20 igneous rock samples, we established the relationship between P-waves and S-waves velocities, porosity, and density of the igneous rocks, providing a fundamental understanding of the velocity characteristics in this area. Subsequently, the study employed the constrained sparse pulse inversion method, specifically tailored for igneous rock, to conduct wave impedance inversion and develop a velocity model. Furthermore, utilizing the Wyllie formula and P-waves velocity-porosity formula, the rock physical data was fitted at normal temperature and atmospheric pressure to predict the porosity of the Permian igneous rocks, followed by a comparative analysis. Finally, in conjunction with seismic data and the velocity model obtained through inversion, an extensive analysis of numerous drilling failures in the Permian system was conducted. The findings were then applied to actual drilling scenarios, leading to the formulation of recommendations for drilling operations in this area.
DOI: 10.15372/GiG2024166 |
