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文昌X洼陷总体呈南断北超的箕状断陷结构。新生代以来,洼陷总体经历了早期断陷、中期断拗转换和晚期拗陷的构造演化过程,洼陷中沉积了古近系、新近系和第四系地层。断陷期洼陷中沉积了厚层中深湖和浅湖相源岩,现今已进入生烃高峰期,可作为神狐隆起北缘的又一烃源灶。
The Wenchang X-sag generally shows a half-graben-like fault-faulted structure in the south. Since the Cenozoic, the sag has undergone the process of early fault depression, mid-term fault depression conversion and tectonic evolution of the late depression. Paleogene, Neogene and Quaternary sediments were deposited in the depression. Thick rims and shallow lacustrine rocks have been deposited in the depocentiological depressions. Nowadays, they have entered the peak period of hydrocarbon generation and can be used as another source stove for the north margin of the Shenxifeng uplift.