库车前陆冲断带高压低渗储层测井评价新方法与应用

我国中西部地区前陆盆地山前逆冲构造带挤压应力异常强烈，强烈的构造应力不仅改变了储层的性质，而且还使得油气的分布异常复杂，加之沉积地层近物源，储层物性普遍较差，属低孔低渗储层。针对库车前陆冲断带复杂地质条件下的油气勘探中测井所面临岩性识别、储层参数的计算以及流体识别等一系列技术难题，文章通过在库车前陆冲断带高压低渗储层综合应用了阵列感应、偶极横波、元素俘获、微电阻率成像等一系列新的测井方法与评价技术，开展了利用新测井资料定量计算地层饱和度、准确识别气水界面、精确确定地层矿物含量并在此基础上评价致密储层的有效性的方法。将这些方法应用在库车冲断带高压低渗储层的测井评价中，建立了塔里木盆地陆相岩屑砂岩高压低渗储层测井评价方法与标准，取得了较好的勘探效果，为油田探明、控制、预测等各级储量的测井储层参数和地质工程研究提供了可靠的技术支持。

NEW APPROACHES OF LOGGING EVALUATION AND THEIR APPLICATION IN RESERVOIRS WITH HIGH PRESSURE AND LOW PERMEABILITY IN KUQA FORELAND THRUST BELT

Compressive stress is very strong in the piedmont thrust belt of the foreland basins in western-central China. It has not only changed the reservoir properties, but also complicated the distribution of hydrocarbons. Moreover, the reservoirs were deposited near the source, thus their poroperm characteristics generally are of low porosity and low permeability. In view of a series of technical problems facing logging interpretation in the process of exploration under the complex geological conditions in the study area, such as identification of lithologies, calculation of reservoir parameters and identification of fluids, various new logging and evaluation techniques, such as array IES, dipole transverse wave, element capture, and microresistivity imaging, are applied in the reservoirs with high pressure and low permeability in the study area. Studies are carried out in respects of quantitative calculation of saturation, accurate identification of GWC, accurate calculation of mineral contents in the formations, and effective evaluation of tight reservoirs by using new logging data. These methods are used to evaluate the reservoirs with high pressure and low permeability in the study area, and to establish a set of logging evaluation methods and criteria for the marine lithic sandstone reservoirs with high pressure and low permeability in the Tarim Basin. They provide reliable technical support for study of the logging reservoir parameters and geological engineering of the proved, controlled, and predicted reserves.