Abstract: Tight glutenite reservoirs in Block Madong 2 at the eastern slope of the Mahu sag in the Junggar Basin are buried deeply, poor in physical properties, and very sensitive to water and pressure; and the glutenite is hard to grade, strongly heterogeneous and brittle, so that it is difficult to get economic exploitation. With experiences from adjacent regions, and integrating geologic cognitions with engineering techniques, the engineering design of the first horizontal evaluation well (Madong 1) in this block was optimized, and the advanced technology was introduced to guarantee application effect. Specifically, many core experiments and fine well logging interpretation were conducted to identify the lithologies and physical properties of the glutenites; fine seismic acquisition, processing and interpretation were carried out and the method of classifying glutenite reservoirs was established to optimize target layers and well trajectories; advanced geosteering tools and real-time model-updating technique were used to increase drill-in rate and drilling efficiency; and well test and numerical stimulation were performed to study factors affecting post-fracturing production of glutenite reservoirs and optimize engineering techniques. Base on multidisciplinary cooperation, Well Madong 1 obtained average oil production of 53.9 t/d through a 3-mm choke at stable water cut. Such production increase is much higher than a vertical well in the block.

Key words: geology-engineering integration, Mahu sag, tight oil, glutenite, reservoir stimulation