【作者】 谭成轩； 张明利； 汤良杰； 孙炜锋；

【Author】 Tan Chengxuan Zhang Mingli Jin Zhijun Tang Liangjie Sun WeifengInstitute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081.Institute of hydrocarbon exploration and development, China Petroleum & Chemical cooperation,Beijing 100083.Petroleum University, Beijing 102249.

【机构】 中国地质科学院地质力学研究所； 中国石油化工集团公司石油勘探开发科学研究院； 石油大学(北京)；

【摘要】 克拉2气田异常高地层压力有不同的成因解释,主要有构造抬升作用、不均衡压实作用、天然气生成和大量充注、构造挤压等。已有研究表明构造抬升作用和不均衡压实作用不能在储层造成异常高压;天然气生成和大量充注解释有一定的合理性,但尚处于定性分析;构造应力挤压作用是人们普遍认为有效的少数几种增压机制之一,但目前属于一种定性分析,其对异常高地层压力有多大贡献需从定量的角度作进一步研究。为此,进行了克拉2气田三维应力场有限元数值模拟。研究结果表明克拉2井异常高地层压力中有52～55MPa由构造应力作用引起,剩余部分由其他增压机制引起。该研究对于准确评价气田的储量、指导气田开发等有一定的意义。更多还原

【Abstract】 There are different genesis explanations on the overpressure at KL 2 gas field, such as tectonic uplifting, inhomogeneous compaction, gas generation and fully filling, tectonic compression, and so on. Existed research results show that the first and second factors are impossible to produce such overpressure at the reservoirs of KL 2 gas field, and that the third factor has some reasonability, but still at the state of qualitative analysis, and needs to do further study. Tectonic compression is taken as an effective over-pressuring mechanism, however, it is just a qualitative analysis too, and what about its quantitative contribution to the overpressure is necessary to be conducted. Therefore, a three-dimensional tectonic stress field covering KL 2 gas field is simulated to discuss the plane distribution of mean effective stress. The results show that tectonic stress compression results in 52-55MPa in the overpressure of KL 2 well, and that the rest overpressure caused by other over-pressuring mechanisms. This research has significance for reasonably assessing and developing KL 2 gas field.更多还原