Innovation and scale practice of key technologies for the exploration and development of tight sandstone gas reservoirs in Yan'an Gas Field of southeastern Ordos Basin

Innovation and scale practice of key technologies for the exploration and development of tight sandstone gas reservoirs in Yan'an Gas Field of southeastern Ordos Basin

Natural gas

Energy security

Gas industry

Proven reserves

Petroleum reservoirs

Gases

Natural gas fields

Productivity

Knowledge based systems

Metamorphic rocks

Natural gas well production

Sandstone

Tight gas

In order to figure out the accumulation law of tight sandstone gas in the southeastern Ordos Basin and solve the problems in the large-scale benefit productivity construction of Shaanxi Yanchang Petroleum (Group) Co., Ltd., this paper carries out multidisciplinary studies on the geological theories of Upper Paleozoic sedimentation-reservoir-hydrocarbon accumulation in the southeastern Ordos Basin following the research idea of integrated production, learning, study and application. Then, key technologies are systematically studied, such as reservoir prediction based on dynamic knowledge base, three-dimensional production mode of hybrid well pattern, and dynamic optimization and adjustment of gas reservoirs. Thus, geological theories and key development technologies are innovatively improved and large-scale benefit productivity construction is achieved overall. And the following research results are obtained. First, it is determined that it was a deposit of delta front in the southeastern Ordos Basin during the Permian and the shoreline of the shallow water environment migrated frequently then, which controlled the development of reservoir sandbodies. A "sweet spot" development model of high-quality tight sandstone gas reservoir is established. Second, a target optimization technology based on multi-element full-process natural gas migration and accumulation simulation is developed, which provides efficient guidance for the selection of favorable exploration areas. Third, the prediction reliability of effective reservoir is improved based on dynamic knowledge base, and the hybrid well pattern for three-dimensional production technology based on the differentiated design of well pattern elements is established. Fourth, the dynamic optimization technology of gas reservoir development taking pressure tracking and intelligent production optimization as the cores is developed. As a result, the scale effective production and long-term stable production is realized in Yan'an Gas Field. In conclusion, the new understanding of a series of geological theories and the application of key development technologies provide a support for the discovery of natural gas proved reserves of 7635108 m3 and the productivity construction of 71.4108 m3/a in Yan'an Gas Field, as well as a reference for the exploration and development of similar tight gas reservoirs and make an important contribution to national energy security. 2022, Natural Gas Industry Journal Agency. All right reserved.

102-113

42

Natural Gas Industry

2022

Wang, Xiangzeng

Qiao, Xiangyang

Zhang, Lei

Wang, Yongke

Zhou, Jinsong

Du, Yonghui

Cao, Jun

Xin, Cuiping

Song, Jiaxuan

Yuan, Fangzheng

journalArticle

10000976

10.3787/j.issn.1000-0976.2022.01.010