| Comprehensive logging technology is the most foundational technical in oil and gas exploration and engineering development activity, and is the most efficient way in discovering and evaluating hydrocarbon reservoirs, so it is called "the eyes of observing the underground palace ". At present, in our country reservoir geological visualized research is basically2D research, the3D visualization research is still in its infancy. Compared with2D visualization technology,3D visualization technology has more prominent advantages. It can express the information of rocks, geological structure, strata form more visually, directly, precisely, so3D visualization research of geological modeling plays more outstanding role in comprehensive logging. The hole trajectory is an important basis in most visually displaying hole conditions and control level of well deflection. Through the implementation of3D visualization technology the technical personnel can observe the timely drilling information and working state formation while drilling. So the introduction of the3D visualization technology promotes the development of the new comprehensive logging technology.This paper used a3D visualization technology to realize3D visualization description of underground geological environment and the hole trajectory state in comprehensive logging instrument. It used VC++6.0and OPENGL graphics interface as a development platform. After generating TIN through the Delaunay triangulations multilayer DEMs is constructed by the linear and bilinear interpolation, to realize the3D visualization of the strat. Reading real drill data received by LWD/MWD and drilling guidance data of comprehensive logging instrument and other data, the hole trajectory3D visualization will realize through processing these data. This thesis is studied mainly on following aspects:(1) Extensive data access summary present academia widely used all kinds of three dimensional space modeling model, and then to each model are discussed and research, and overall understanding each model of strengths and weaknesses, which selected3D modeling solutions.(2) Study graphic drawing process and rendering methods in OPENGL.(3) For the selected3D modeling scheme for further analysis and research. Especially Delaunay triangulations algorithm further careful study, then the point by point insertion method will discrete two-dimensional simulation data points triangulations fitting out of TIN, and finally by using multi-level DEMs modeling to achieve strata and the hole trajectory of the3D visualization. (4) Through comprehensive logging instrument with the union, the oil exploration and drilling site over transfer data processing, and then on the3D graphics modeling generation intuitive vivid3D images, make comprehensive logging instrument realize3D visual function.(5) The3D piping design principle of the method, simulated3D drilling track.(6) From any direction can provide for three dimensional geologic choose the cutting plane for cutting generation plane, so that the researchers observed in the structure of the strata.The visualization software on3D strata and the hole trajectory state by the article provides a reference idea on the realization of borehole trajectory visualization.It gives a clear demonstration of the attachment relationship of the wellbore track and3D strata, at the same time, it realizes the3D play of the layer as well as the well trajectory, the functions of the translation, rotation and zoom of image. |
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