东濮凹陷沙三段盐丘浅析

东濮凹陷主要勘探目的层沙河街组以砂泥岩和盐岩为主。文留地区沙三段分为4段，自下而上记为沙三^4、沙三^3、沙三6^2、沙三^1，其中，沙三^4和沙三^2为盐层（后文称为沙三^4盐、沙三^2盐)。

An approach to the formation of salt domes in Dongpu sag

From the analysis results of seismic reflection charac ters of seismic lines of L1238, L1476 and L1585 in Wenliu block of Dongpu sag an d combined with the drilling data of S 3 salt rocks from Wells Wen19, Wen69, We n64 and Wen218, it can be clearly seen that there really exist salt domes in Don gpu sag. The origin of the salt domes is that due to the action of the buoyancy created by the reverse of the gravity flow, which caused the S 3 salt rocks dev eloped in the deep parts of western and eastern Dongpu sag, moving upward along the fault planes of the Wenxi and Wendong faults and to the differential compact ion, which promoted the salt rocks arching upward and piercing the overburden to form salt domes. At present, oil and gas reservoirs are found above, below and beside the salt domes. The authors consider that the salt rocks of S 3 2 drill ed by Well Wen218, the sandstone and mudstone of S 3 3 and in the right salt o f S 3 4, the tight Mesozoic and Paleozoic Groups, and the Wenxi fault form tog ether a favorable oil and gas trap belt, and there may be many undiscovered oil/ gas traps related to salt domes in Wenliu region, indicating a positive explorat ion potential.