致密砂岩气藏开发阶段地层研究尺度

随着油气田开发的深入，油气藏描述需要更加精细的地层划分对比方案，但需要讨论研究尺度的合理性。以新召东区致密砂岩气藏为例，通过对地质特征、开采现状和地震条件的统计分析，认为需要分析地震资料品质、沉积相类型和砂体可分性等3方面因素。地震资料品质考查的是地震能够分辨的单砂体厚度，沉积相类型研究的是砂体发育程度及连续性，砂体可分性揭示的是小层内测井可识别的单砂体个数。研究成果可为开发阶段地层研究尺度确定提供借鉴。

Stratigraphic Study Scale at the Development Stage of Tight Sand Gas Reservoirs

With the development of oil and gas reservoirs, more detailed stratigraphic subdivision and correlation scheme is needed, but it is under what kind of study scale is reasonable. An example is shown from the tight sand gas reservoir of the Xinzhaodong area in the Ordos Basin, China. Through statistical analysis of geological features, exploitation status and data conditions, three factors are considered to be important, including seismic data quality, sedimentary facies type, separability of sand bodies. Seismic data quality determines the thickness of single sand body that can be resolved, sedimentary facies type reveals the general law of sandstone distribution and lateral continuity, and separability of sand bodies involves the number of single sand body that can be recognized by logging within subzones. The research results can offer insights for the determination of stratigraphic study scale of oil and gas reservoirs at the development stage.