鄂尔多斯东北部致密砂岩气藏地层水成因及分布规律

doi:10.11743/ogg20190210

Abstract

Abstract: The chemical features,genesis,spatial distribution characteristics and controlling factors of the formation water in Shenmu gas field,northeastern Ordos Basin,were studied by the analysis of seismic,drilling and logging,as well as performance data combined with test analysis of mercury injection,gas-water relative permeability,physical and hydrochemical properties.Since the studied area is located in the transitional area from water to gas,the formation water herein is of "V-shaped" CaCl₂ type,with low salinity"acid water" and high salinity conventional formation water being dominant.Vertically,the differential distribution of formation water are mainly caused by the differences of deposition,lithofacies and distance from gas source for various formations.Multiple tight limestones distributed in the Benxi and Taiyuan Formations have blocked the entry of hydrocarbons into reservoirs,leading to a low degree of gas charging for the original reservoirs and relatively high enrichment of formation water.The Shiqianfeng Formation,located far away from gas source,is in short of hydrocarbon supply with incomplete gas displacement of water.The Shanxi Formation is a self-sourced indi-genous play,which has a high degree of gas charging and low quantity of water produced.Horizontally,influenced by the "west-dipping" structural movement of the basin in the Late Cretaceous,the northeastern Ordos Basin uplifted as a whole along with the secondary adjustment of water/gas contact,producing more gas-bearing horizons and continuously increa-sing the height of gas columns; meanwhile,the pressure in the gas reservoir decreased,and the formation water at the basin margin invaded into bed laterally,leading to the pattern of "multiple gas layers,low gas yield and water-gas co-production",characterized by the ever-increasing formation water scale and water production from west to east with a gradual increase of salinity.The results provide some basis for prediction of the spatial distribution and genesis of gas and water at the margin of the Ordos Basin.

Key words: gas-water distribution, acid water, formation water, tight sand gas, Ordos Basin

CLC Number:

TE133

Chen Zhaobing, Yang Youyun, Shao Jinhui, Zhu Yushuang, Chen Xinjing, Shi Lei, Meng Di. Origin and distribution of formation water in tight sandstone reservoirs in the northeastern Ordos Basin[J]. Oil & Gas Geology, 2019, 40(2): 313-325.

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Origin and distribution of formation water in tight sandstone reservoirs in the northeastern Ordos Basin

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