The Research And Application Of High Accuracy 3D Seismic Exploration In Biyang Depression

Biyang depression locates in the south part of Henan province, It's a Mesozoic and Cenozoic terrestrial facies lake fault depression which grows on Qinling folded zone, it is about 1000 1000 km2 and famous for"small and abundant". According to the third resource evaluation: the total resource in Biyang depression is 3.38×108t,its 59.2% is ascertained, still there is 1.38×108t resource remained for exploring. But after thirty years of petroleum and gas exploration, the exploration in Biyang depression enters high mature exploration period, difficulty of exploration becomes more serious, the exploration targets become more complex. To continue the exploration deeply, we have to resolve the choke points, and the unfavorable quality of seismic data having been collected is one of the choke points which affects continuing the exploration in Biyang depression deeply, By analyzing it is considered that high accuracy 3D seismic exThe author makes the Biyang depression as the research and test area, bases on the needs of exploration production, combines scientific research and exploration production, aims at the structure sediment feature, attempts to discover, research and resolve 3D seismic exploration technological difficulty and methods meeting after the second exploration in Biyang depression. First the thesis describes home and abroad high accuracy 3D seismic exploration technology and its present application situation; Then discusses high accuracy 3D seismic exploration technology connotation and technology key; on base of that, the thesis expounds the research clue and practice procedure of high accuracy 3D seismic exploration technology; adopting the instance exploration in Biyang depression, it analyzes the application effect of high accuracy 3D seismic exploration technology in exploration of Biyang depression; Finally the author gives suggestion and supposition for the next work. The achievement of this thesis is listed below.1) Putting high accuracy 3D seismic exploration technology connotation as the theory foundation, combing the structure sediment feature in Biyang depression, aiming at shallow, medium and deep series of strata, researching and summing up three technology series: series of complex fault block group high accuracy 3D seismic exploration technology in north Biyang depression; series of deep series of strata high accuracy 3D seismic exploration technology in middle Biyang depression; series of actic region high accuracy 3D seismic exploration technology in south Biyang depression.2) This thesis emphasizes quality control of different high accuracy 3D seismic exploration technology segments, and especially that new concept must be established for high accuracy 3D seismic exploration. In the practice of high accuracy 3D seismic exploration, it is essential to build the concept of"interactive seismic exploration"and"integration, that is high accuracy 3D seismic exploration design and demonstration, acquisition, data process integrated with geology targets, and integration of 3D acquisition, data process and interpretation.3)In the process of practicing, the author researches and utilizes a series of new methods and technologies: for the first time adopting acquisition technology of new concept about base on imaging effect and dispersion technology, and each point designing well depth method base on fine surface structure investigation, the quality of the field acquisition data are improved to an extent; researches and applies depressing multiples through deleting and fitting method,the resolution and S/N of seismic data are improved effectively; applies attribute analyzing technology base on sensitivity and feasibility analyzing, the siltstone interbeds prediction accuracy greatly.4)By developing technology, the domain frequency of high accuracy seismic data is improved 10 to 15 Hz comparing the old data's, the ratio of signal to noise is improved to 5 to 6, the faults whose magnitude of fault are more than 15 meters, traps more than 0.05km2, all kinds of structure which the amplitude are more than 20 meters can be distinguished; the lithology bodies which the thickness are more than 15 meters can be predicted.5)After generalizing and implementing the achievement new exploration achievement was gained. 421 new traps are discovered and re-carried out, trap reserves is 15265×104t,the rate of successful prospecting well reaches 49%, the proven reserves is 5060.09×104t. upstanding economic benefit and social benefit are obtained.The achievement of this thesis not only can promote the next step exploration in Biyang depression, Henan Oil Field, but also can provided seismic exploration references and directions for the same kind of domestic landing facies fault depression basins.