川西中浅层高效成藏模式研究

发布时间：2018-08-16 10:53

【摘要】：川西坳陷中浅层河道砂岩气藏的成藏模式众多,但不同成藏模式控制下的成藏区域或层系的开发效益存在明显差异。本文通过解剖川西坳陷中浅层河道砂岩气藏高效开发层系或区域的成藏地质条件,明确该区中浅层高效成藏模式为"香肠式"成藏,该成藏模式包括两个重要环节,即"香肠式"充注和"香肠式"圈闭。研究表明"香肠式"成藏必须同时具备以下几个基本条件:(1)条带状外形的河道砂体;(2)河道砂体一端存在明显的岩性尖灭;(3)河道砂体另一端延伸至中浅层源岩断层发育区内;(4)河道砂体一端直接相接的源岩断层的倾角小;(5)单斜背景下的岩性圈闭。通过后期钻井测试、试采证实,具备"香肠式"成藏条件的区域或层系,单井产能高,稳产时间长,且无水产出。类比分析,在地质条件相当的其他地区河道砂岩气藏的勘探开发中,该成藏模式可作为一种高效成藏模式来进行推广运用。
[Abstract]:There are many reservoir forming models in the middle and shallow channel sandstone gas reservoirs in western Sichuan depression, but there are obvious differences in the development benefits of the reservoir forming regions or strata under the control of different reservoir forming models. By dissecting the geological conditions of the reservoir formation in the middle and shallow channel sandstone gas reservoirs in the western Sichuan depression, it is clear in this paper that the middle-shallow reservoir forming model is "sausage type", which includes two important links. That is, sausage filling and sausage trap. The study shows that the sausage type reservoir must have the following basic conditions simultaneously: (1) the channel sand body with belt shape; (2) the obvious lithologic pinning at one end of the channel sand body; (3) the channel sand body extending to the middle and shallow source rock fault at the other end. (4) the dip angle of the source rock fault directly connected with one end of the channel sand body is small; (5) the lithologic trap in monoclinic setting. Through the later drilling test, it is proved that the region or layer with sausage type reservoir conditions has high single well productivity, long stable production time and anhydrous production. Analogy analysis shows that in the exploration and development of channel sandstone gas reservoirs in other areas with similar geological conditions, the reservoir formation model can be used as an efficient reservoir forming model to be popularized and applied.
【作者单位】：中国石化西南油气分公司勘探开发研究院;成都理工大学能源学院;
【基金】：国家重大专项项目(2016ZX05048-004-001)
【分类号】：P618.13

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