鄂尔多斯盆地非常规资源微孔隙储层测井评价

鄂尔多斯盆地处于中国中西部结合部位,是中国大型叠合含油气盆地之一,油气资源极为丰富.经过多年的勘探开发,鄂尔多斯盆地形成了"南油北气"的开发局面,建成了多个大型油气田.为了保持油气田的可持续开采,需要积极寻找可接替区域和层位.利用烃源岩资料、岩心资料及大量测井资料和试气资料对研究区潜在油气层位的储集性能、运移通道及测井响应特征进行了分析.结果 表明研究区太原组致密灰岩、本溪组铝土质泥岩、延长组长7"张家滩页岩"、太原组、山西组和延安组煤层普遍微孔隙发育,具备一定的储集能力,加之研究区烃源岩丰富,在油气运移的过程中,这些地层在适当的条件下能够形成不同于常规致密砂岩的非常规储层,具有成为可接替层位的潜力.

The logging evaluation of non-conventional micro-porosity reservoirs in Ordos Basin

With the decrease of remaining conventional oil and gas resources, the focus of global energy exploration is gradually shifting to unconventional oil and gas resources. Driven by advancing theories and exploration technologies, a series of significant advances have been made in the exploration and development of unconventional oil and gas around the world, represented by shale oil and gas, oil sands, heavy oil and gas hydrate. Unconventional oil and gas production is growing rapidly and has become an important part of global oil and gas production. Ordos Basin, located in the joint part of central and western China, is one of the large superposed oil-bearing basins in China, with extremely rich oil and gas resources. At present, the exploration and development of Ordos Basin mainly consists of low permeability tight sandstone reservoirs in Mesozoic and upper Paleozoic. After years of exploration and development, Ordos Basin has formed a development situation of "South Oil and North gas". In the north, Sulige gas field, Daniudi gas field and other large gas fields have been built and in the south, Jingbian oilfield, Zhenjing oilfield and other oilfields have been built. In 2019, major exploration discoveries have been made in the Chang-7 oil source reservoir of the basin, and a 1 billion ton Qingcheng oilfield has been found. In the exploration and development process of Ordos Basin, it was also noted that some strata that were not considered to have the production capacity could also produce when mining the conventional tight sandstone in the main target strata, such as the tight limestone of Taiyuan Formation, bauxitic mudstone of Benxi Formation, and Chang7 "Zhangjiatan shale". By analyzing the core and logging data, it is found that micro pores in these formations are generally developed and have certain storage capacity. Due to the abundant source rocks in this area, these reservoirs with storage capacity can form unconventional reservoirs different from conventional tight sandstone under appropriate conditions during the process of oil and gas migration. In this paper, logging data are mainly used to study these unconventional reservoirs to provide ideas and support for reservoir increase and replacement in Ordos Basin.