Progress of 3D seismic exploration technologies and oil and gas exploration and development performance in the loess tableland area of the Ordos Basin

doi:10.3969/j.issn.1672-7703.2020.01.007

Abstract

Abstract: The Loess tableland area of the Ordos Basin is a world-famous challenging area for seismic exploration. In order to solve issues in high-efficiency oil exploration and development, such as sweet spots prediction of shale reservoirs, characterization of low-amplitude structures, distribution of small faults and fractures, and real-time geo-steering drilling in horizontal wells, studies have been carried out for many years on seismic exploration and several technologies have been developed. These include: 3D seismic exploration with wide azimuth and broad coverage excited jointly by well shot on loess tableland and low-frequency vibrators; 3D grid tomographic static correction constrained by ultra-deep micro-logging and near-surface absorption compensation on loess tableland, and sweet spot prediction based on comprehensive evaluation of multi-attribute dimension reduction and geological probability, etc. In the Panke 3D “joint excitation of well shot and vibrator” seismic survey area of Heshui County and Ning County loess tableland of Eastern Gansu Province, the average penetration rate is up to 87.4% in shale reservoirs, with seismic geo-steering drilling in horizontal wells. This is more than 10% higher than penetration rates without seismic geo-steering tools. This has become a typical demonstration area in the Changqing oil field, combining seismic technology application with oilfield development. In the Yanchi area of Ningxia province, 3D seismic exploration with low-frequency vibrator and broad coverage technologies has been applied widely. The success rate of reservoir prediction is 72.1%, which is more than twice as high as previous 2D seismic surveys. A breakthrough has therefore been achieved in seismic exploration technologies in the loess tableland area, strongly supporting new discoveries and efficient development in oil and gas fields.

CLC Number:

Fu Suotang, Wang Daxing, Yao Zonghui. Progress of 3D seismic exploration technologies and oil and gas exploration and development performance in the loess tableland area of the Ordos Basin[J]. China Petroleum Exploration, 2020, 25(1): 67-77.

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