US 11,921,099 B2
Method for quantitatively analyzing reservoir formation of ultra-deep evaporite-dolomite symbiotic system
Fei Huo, Chengdu (CN); Xingzhi Wang, Chengdu (CN); Huaguo Wen, Chengdu (CN); Huiwen Huang, Chengdu (CN); Yunbo Ruan, Chengdu (CN); and Liang Li, Chengdu (CN)
Assigned to SOUTHWEST PETROLEUM UNIVERSITY, Chengdu (CN)
Filed by SOUTHWEST PETROLEUM UNIVERSITY, Chengdu (CN)
Filed on Jul. 31, 2023, as Appl. No. 18/362,045.
Prior Publication US 2024/0019414 A1, Jan. 18, 2024
Int. Cl. G01N 33/24 (2006.01); G01N 23/20 (2018.01); G01N 23/2254 (2018.01); H01J 49/10 (2006.01)
CPC G01N 33/24 (2013.01) [G01N 23/20 (2013.01); G01N 23/2254 (2013.01); H01J 49/105 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for quantitatively analyzing reservoir formation of an ultra-deep evaporite-dolomite paragenesis system, comprising:
step (1) selecting a typical key drilled well to observe a core characteristic of a development section of the ultra-deep evaporite-dolomite paragenesis system; and
describing and determining a vertical development characteristic of the ultra-deep evaporite-dolomite paragenesis system to determine a development and distribution regularity of the ultra-deep evaporite-dolomite paragenesis system;
step (2) selecting a typical field outcrop section; obtaining field outcrop data of the ultra-deep evaporite-dolomite paragenesis system through combination of typical section measurement and key section observation; and collecting a paragenetic evaporite-dolomite sample for laboratory research;
step (3) systematically collecting logging data of an evaporite stratum to establish a lithology identification plate; recording a thickness of an evaporite and marking a planar boundary of the evaporite; establishing a thickness isoline map of the evaporite and a dolomite in a layered manner; and identifying a planar distribution pattern of individual components of the ultra-deep evaporite-dolomite paragenesis system;
step (4) based on the development and distribution regularity obtained in step (1) and the field outcrop data obtained in step (2), analyzing and determining a combination pattern of the ultra-deep evaporite-dolomite paragenesis system to investigate an evolution pattern and a planar distribution characteristic of a combination of different substances in the ultra-deep evaporite-dolomite paragenesis system;
step (5) with a salt inclusion as an initial fluid, inversing a property of a diagenetic fluid by measuring race and rare-earth elements, C, O, Sr and Mg isotopes and clumped isotopes of the dolomite; performing a simulation experiment of a water-rock interaction during a main evolution phase according to petrological characteristics of the ultra-deep evaporite-dolomite paragenesis system in combination with burial history; and
with strata water in a current drilled well as an end point, systematically inversing temperature and pressure characteristics and water-rock interaction process of a diagenetic system to obtain characteristics of a diagenetic field and a transformation force and an evolution process of the diagenetic field, so as to determine the diagenetic system; and
step (6) based on the planar distribution pattern obtained in step (3) and the evolution pattern and the planar distribution characteristic obtained in step (4), identifying a type of a reservoir, and analyzing development characteristic and regularity of the reservoir;
based on the diagenetic system determined in step (5), analyzing an evolution and formation process of the reservoir and a reservoir formation mechanism to establish a reservoir development model; and
quantitatively analyzing the reservoir formation of the ultra-deep evaporite-dolomite paragenesis system based on the reservoir development model.