Properties of diagenetic fluid systems and their influences: taking Ahe Formation reservoir in Yiqikelike Structural Bett of the Kuqa Depression Tarim Basin as an example.

Based on the data of thin section, scanning electron microscope, X-ray diffraction of clay minerals, formation water and physical property parameters, we systematically analyzed the petrology, and formation water of the Lower Jurassic The Formation sandstone in the Yiqikeiike Structural Belt of Kuqa Depression, Tarim Basin, combined with the thermal-burial history and the distribution law of fractures and faults of the Ahe Formation in the Yiqikelike Structural Belt, the sealing characteristics of diagenetic fluid, and the oil and gas preservation conditions of the The Formation sandstone reservoirs in the axis and limb of Yiqikelike Anticline are discussed. The results show that volume fraction of authigenic kaoiinite in the Ahe Formation sandstone is relatively high in the aniline axis, but relatively low in the limb. The difference of dlagenetic evolution sequence between the axis and limb of the Yiqikelike Anticline is about 5 Ma ago. Compared with the antilime limb, the sodium chloride coefficient and desulfurization coefficient in the formation water of Ahe Formation in the anticline axis are higher, and the metamorphic coefficient is lower; the sealing property of dlagenetic and system of the Ahe Formation sandstone in the anticline axis is weaker than that in the anticline limb, which affects the accumulation of natural gas. The results have great significance for predicting the distribution of oil and gas reservoirs in Yqqikelike Structural Belt. [ABSTRACT FROM AUTHOR]