靖边气田东侧陕X区块古地貌和气水分布规律
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Paleo-geomorphology and gas-water distribution law in Shaan X block on the east side of Jingbian gas field
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    摘要:

    靖边东侧陕X区块作为开发新区,下古岩溶古地貌较为复杂,同时气水分布规律不清。本次研究中基于钻测井资料、岩心、薄片和其他分析测试分析认为该区下古发育典型的岩溶角砾岩,储层岩性主要为细粉晶白云岩,储集空间主要为溶蚀孔、晶间微孔和裂缝。该区相对靖边地区,整体孔渗偏差,储层较为致密。本次通过印模法和残厚法对古地貌进行定性恢复,结果显示,研究区整体处于岩溶斜坡和岩溶洼地过渡地带,沟槽仅在研究区北部发育,从古地貌高部位到低部位,物性逐渐变差,储层逐渐致密。陕X区块气水整体受古地貌控制,局部受现今构造控制。其中在西部古地貌相对高部位下古基本不出水,东北区接近沟槽区域气水复杂,其中出水井点主要位于现今构造低洼部位,东南区古地貌为岩溶洼地,储层基本致密,下古普遍产水。

    Abstract:

    The Shaan X block on the east side of Jingbian Oilfield is a new development zone. The Lower Paleokarst and Paleotopography is more complicated, and the gas and water distribution law is unclear. In this study, based on drilling and logging data, cores, thin slices and other analysis tests in the area, the reservoir characteristics, paleo-geomorphic characteristics and gas-water distribution laws were studied in the area. Through observation of cores and thin slices, it can be seen that typical karst breccias are developed in the lower paleokarst reservoirs in this area. The reservoir lithology is mainly fine powder crystal dolomite, and the reservoir space is mainly composed of dissolved pores, intercrystalline micropores and crack. Compared with the Jingbian area, this area has an overall deviation of porosity and permeability, weak dissolution, and tighter reservoirs. The study of paleogeomorphology is mainly studied through the combination of impression method and residual thickness method for qualitative and quantitative paleomorphology restoration. The results show that the study area is in the transition zone between karst slopes and karst depressions as a whole, and grooves are only developed in the northern part of the study area. From the high part to the low part of the paleogeomorphology, the reservoir gradually becomes dense and the physical properties gradually deteriorate. Based on the distribution characteristics of gas and water on the plane, combined with the characteristics of reservoirs and paleogeomorphology, it can be seen that the gas and water of Shaan X block is controlled by paleogeomorphology as a whole, and partially controlled by current structures. Among them, there is basically no water in the relatively high part of the paleogeomorphology in the west. The gas and water in the area near the groove in the northeast area are complex, and the water outlet wells are mainly located in the low-lying parts of the present structure. The paleogeomorphology in the southeast area is a karst depression, the reservoir is basically tight, and the gas wells generally produce water.

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贾浪波,刘海锋,薛云龙,等. 靖边气田东侧陕X区块古地貌和气水分布规律[J]. 科学技术与工程, 2023, 23(12): 5022-5032.
Jia Langbo, Liu Haifeng, Xue Yunlong, et al. Paleo-geomorphology and gas-water distribution law in Shaan X block on the east side of Jingbian gas field[J]. Science Technology and Engineering,2023,23(12):5022-5032.

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  • 收稿日期:2022-03-29
  • 最后修改日期:2023-02-19
  • 录用日期:2022-09-29
  • 在线发布日期: 2023-05-24
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