天然气工业2024，Vol.44Issue(5)：68-79,12.DOI:10.3787/j.issn.1000-0976.2024.05.006
四川盆地中部地区震旦系大型碳酸盐岩气藏开发技术新进展
New technological progress in the development of Sinian large carbonate gas reservoirs in central Sichuan Basin
摘要
Abstract
The gas reservoir of Sinian Dengying Formation in the central Sichuan Basin is a large-sized old deep karst weathering crust type carbonate gas reservoir,and it is overall characterized by low porosity,low permeability,developed small-scale fractures and vugs,and strong reservoir heterogeneity,which bring a series of challenges to its development in terms of reservoir characterization,well deployment and benefit development.Taking the Dengying Formation gas reservoir in the Anyue gas field as the research object,this paper further understands the reservoir development characteristics and formation mechanisms by means of geology-engineering integrated technological research.In addition,a new model of gas reservoir development is proposed,and the key technologies for efficient gas reservoir development are developed.And the following research results are obtained.First,the Dengying Formation reservoir is mainly of karst genesis,and presents the development characteristic of"differential control of superimposed karst on reservoirs".Second,karst reservoir has strong heterogeneity,which can be characterized precisely by means of the"dissolution facies genesis controlling reservoirs".Third,the new development model of"superposition of single well index to demonstrate the scale of gas reservoir"is suitable for the Dengying Formation gas reservoir.Fourth,the"dual-interface"karst paleogeomorphology restoration and quantitative characterization method is innovatively developed to guide the area selection on the plane,which increases the proportion of class Ⅰ and Ⅱ wells from 40%in the evaluation period to 100%in the construction period.Fifth,the small-scale fracture and vug identification and characterization technology is established to guide the drilling trajectory design,which increases the proportion of gas wells with tested production rate of one million cubic meters from 41.6%in the evaluation period to 60%in the construction period.Sixth,the staged acid fracturing technology is improved.As a result,high-quality reservoirs are produced efficiently,low-quality reservoirs are liberated,and the reservoir permeability is increased from 0.62 mD to 6.77 mD after acid fracturing.In conclusion,during the"14th Five-Year Plan"period,these development technologies support the transformation from the efficient development of the fourth Member of Dengying Formation in the marginal platform belt to the long-term stable production and multi-layer benefit development within the platform in the Anyue gas field and from single-well high yield to block high yield and to large-scale gas productivity construction in the Penglai gas bearing area,which will provide powerful support for PetroChina Southwest Oil&Gasfield Company to achieve the production target of 500×108 m³ by the end of the"14th Five-Year Plan"period.关键词
川中地区/安岳气田/蓬莱含气区/震旦系/小尺度缝洞/叠合岩溶/溶蚀相/双界面法Key words
Central Sichuan Basin/Anyue gas field/Penglai gas bearing area/Sinian/Small-scale fracture and vug/Superimposed karst/Dissolution facies/Dual-interface method分类
能源科技引用本文复制引用
闫海军,杨山,季丽丹,王丽珍,夏钦禹,郑国强,杨长城,郭建林,刘曦翔,曹正林,杨东凡,王忠楠,邓惠,张钰祥..四川盆地中部地区震旦系大型碳酸盐岩气藏开发技术新进展[J].天然气工业,2024,44(5):68-79,12.基金项目
中国石油天然气股份有限公司科技项目"老气田'压舱石工程'关键技术研究与示范"(编号:2023YQX103),中国石油集团公司攻关性应用性科技专项"海相碳酸盐岩油气规模增储上产与勘探开发技术研究"(编号:2023ZZ16),四川省自然科学基金下项目"超高压特低孔强非均质碳酸盐岩气藏有效储层物性下限研究"(编号:2023NSFSC0261). （编号:2023YQX103）
