关键词: 中国海油, 鄂尔多斯盆地, 沁水盆地, 煤层气, 致密气, 勘探战略

Abstract: In order to achieve the rapid development of natural gas industry and increase gas production, CNOOC has gradually increased exploration investment in mining rights areas in Ordos Basin and Qinshui Basin, in which there are multiple types of natural gas including tight gas, CBM, and conventional gas, with gas resources of up to 3×10¹²m³ in the two basins and proven gas geological reserves of 7500×10⁸m³ in high-abundance and structurally simple zones. Based on a comprehensive analysis of resource potential and quality, gas accumulation conditions, and exploration technology, CNOOC has proposed a development strategy of increasing onshore natural gas reserves with a level of trillion cubic meters. The company has clarified the guiding ideology of simultaneous exploration of tight gas and CBM and stereoscopic exploration of multi type gas resources, and determined the deployment strategy of accelerating the exploration of deep CBM and tight gas in the eastern part of Ordos Basin and rapidly promoting the exploration of middle and shallow CBM in Qinshui Basin. Furthermore, the comprehensive analysis of exploration fields, gas accumulation and enrichment laws, and exploration technology research directions enables to clarify the key exploration orientations in the near future. The eastern Ordos Basin is characterized by orderly co-occurrence of full oil and gas system in coal measure strata. As a result, it is necessary to conduct exploration in the full gas accumulation system in coal measure strata, consolidate the material basis for increasing reserves and production, focus on tight gas and deep coalbed methane, research on CBM in thin cool seams, Ordovician conventional natural gas, and bauxite rock gas, and promote the simultaneous exploration and replacement of multi type gas resources by applying exploration and development integration and geology and engineering integration, so as to achieve the exploration and development of full gas accumulation system. In the northern and southern parts of Qinshui Basin, it is necessary to promote the volume fracturing of horizontal wells and production technology tests for middle and shallow CBM and popularize its application, and form complementary economic and effective development with thin CBM, so as to promote the overall increase in CBM reserves and production in Qinshui Basin. The exploration activities in the above key areas will ensure the reserve increase and healthy and stable development of large onshore gas region of CNOOC with a level of trillion cubic meters.