【摘要】：利用鄂爾多斯盆地姬塬地區(qū)319個(gè)實(shí)際測(cè)試的長(zhǎng)6油層組地層水分析資料,研究了地層水類型、化學(xué)成分、離子比例系數(shù)、礦化度特征及其平面分布規(guī)律,揭示了地層水特征與油藏聚集保存的關(guān)系。長(zhǎng)6油層組地層水礦化度在中生界中整體偏高,為以Cl~-和K~++Na~+為主的CaCl_2Ⅴ型和Ⅳ型地層水,地層水鈉氯系數(shù)平均值分布在0.49~0.53,脫硫酸系數(shù)平均值分布在5.8~7.2,變質(zhì)系數(shù)平均值分布在40~51,地層總體封閉環(huán)境很好。姬塬地區(qū)長(zhǎng)6油層組現(xiàn)今地層水總體處于封閉的流體動(dòng)力環(huán)境,但在縱向和平面上存在一定的差異。在長(zhǎng)6油層組頂部的長(zhǎng)61段中,西部區(qū)域和東部區(qū)域地層水礦化度和變質(zhì)系數(shù)總體較中部區(qū)域高、地層水鈉氯系數(shù)和脫硫酸系數(shù)較中部區(qū)域低,總體反映了西部區(qū)域和東部區(qū)域流體動(dòng)力環(huán)境的封閉性要好于中部區(qū)域。這與在西部區(qū)域和東部區(qū)域已發(fā)現(xiàn)的油藏比中部區(qū)域多有很好的吻合性,地層水所反映的現(xiàn)今流體動(dòng)力環(huán)境條件較好地代表了油藏的富集保存程度,現(xiàn)今流體動(dòng)力環(huán)境更弱的區(qū)域更有利于油藏的保存。
[Abstract]:Based on the formation water analysis data of 319 practical tests in Jiyuan area of Ordos Basin, the formation water types, chemical composition, ion proportion coefficient, salinity characteristics and their plane distribution are studied, and the relationship between formation water characteristics and reservoir accumulation and preservation is revealed. The salinity of formation water of Chang 6 oil formation is higher than that of mesogenic formation. It is CaCl_2 type V and type IV formation water dominated by Cl~- and K~ Na~. The average distribution of sodium and chlorine coefficient of formation water is 0.49 鈮，

本文編號(hào)：2515921