鄂爾多斯盆地北部十里加汗區(qū)帶致密砂巖儲(chǔ)層流體賦存狀態(tài)及分布特征
[Abstract]:The upper Paleozoic high-yielding gas layer and low-yielding gas layer and (gas-bearing) water layer coexist in the Shilijiahan area of northern Ordos Basin. At present, the characteristics, regularity and influencing factors of gas-water distribution are not well understood. The process of natural gas exploration and development in this area is restricted. Therefore, the data of salinity, pH value and ion content of the Upper Paleozoic formation water in this area are statistically analyzed. It is found that the formation water type in this area is basically CaCl_2 type. Based on the data of drilling core, logging, logging and analysis and testing, combined with the classification and evaluation results of geochemical characteristics of formation water, the origin, type, control factors and spatial distribution characteristics of formation water are clarified, and the gas reservoir in this area is established. The pattern of logging identification of water and dry layers makes clear the occurrence and distribution of reservoir fluid. The conclusions are as follows: (1) CaCl_2 type formation water indicates good stratigraphic sealing in this area, which is favorable for natural gas accumulation to form reservoir; (2) there are free water, capillary water and bound water, free water mainly distributes in the western part of the zone, bound water mainly distributes in the eastern part of the zone, and capillary water exists generally in the whole area; (3) the established log recognition pattern has been applied in Jin86 and other wells in this area, and the result of identification is basically consistent with that of gas test, which indicates that the recognition plate can effectively identify gas and water layers.
【作者單位】: 長(zhǎng)江大學(xué);中石化華北石油工程有限公司測(cè)井分公司;中國石化華北油氣分公司勘探開發(fā)研究院;河南省地礦局第二地質(zhì)礦產(chǎn)調(diào)查院;
【基金】:國家科技重大專項(xiàng)課題“碎屑巖層系大中型油氣田富集規(guī)律與勘探關(guān)鍵技術(shù)”(編號(hào):2011ZX05002-001-002)
【分類號(hào)】:P618.13
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