# Analysis of Hydrocarbon Enrichment in Tight Sandstone Reservoirs in the Eastern Baiyun Depression
## 6 Conclusions  
Aiming at problems such as the development conditions and distribution characteristics of high-quality reservoirs in the eastern Baiyun Depression, this study carried out a series of targeted studies focusing on the special geological background of the eastern Baiyun Depression and reached the following important conclusions:  
1. The eastern Baiyun depression is located on the Baiyun-Liwan continental-oceanic large-scale intershell separation system. During the Wenchang-Enping Formation of the Paleogene, the eastern Baiyun Depression is characterized by a structure-sedimentary pattern of \"fault and uplift interlocking and uplift and depression interphase\". The dissociation collapse stage (upper Wenchang) and fault depression transition stage (Enping Formation) are mainly characterized by toughness, horizontal extension-dissociation and thermal subsidence, accompanied by magmatic floor invasion and uplift structure, subdepression extinction and sedimentary transformation. The magma floor invasion intensity is large, the source of direct erosion and denudation, and the magma floor invasion intensity is from medium to small, which affects the pinching degree of preexisting sediments and regulates the transport channels of the Upper Wenchang and Enping sedimentary systems. 2. The favorable locations for reservoir development in the study area were the WXD-5 region and WXD-7 region target areas. The medium and large lithologic trap (WXD-5 region target) is located at the inclined end of the western margin of the low bulge in eastern Yunnan. The reservoir type is the shoreline beach bar of the Upper Wenchang-Enping Formation and the basement buried hill of the Mesozoic. It can supply hydrocarbons from the eastern wing of the Baiyun Dongwa and Liwan 3 Wa, and be transported by the near-source slope, fault and sand body, so it has great exploration potential. In the large and medium-sized lithologic trap (WXD-7 region target), located in the west margin of the Yundong low bulge, the reservoir type is a braided river delta sand body of the Lower Wenchangwen 4 and Wen 5 members. It is located on the raised slope of the east wing of the Baiyun main depression, the reservoir (lower Wenchang Delta) cap (Zhuhai Formation mudstone) combination conditions are superior, the hydrocarbon near-source migration and accumulation efficiency is high and the scale of accumulation is favorable. Conceptualization, X.W. and N.Q. ; methodology, X.W. and Z.L. ; software, Z.W. and Z.L. ; validation, N.Q. and X.Z. ; formal analysis, X.W. and Z.L. ; investigation, X.W. ; resources, X.Z. and N.Q. ; data curation, Z.L. ; writing--original draft preparation, X.W. ; writing--review and editing, Z.L. and Z.W. ; visualization, X.W. ; supervision, N.Q. and X.Z. ; project administration, X.Z. ; funding acquisition, X.Z. All authors have read and agreed to the published version of the manuscript. Figure 10: Model diagram of target hydrocarbon accumulation in WXD-7 region structure. **Funding:** This research was funded by (1) China National Offshore Oil Co., Ltd. \"14 th Five-Year\" major Science and technology project (No. KJGG2022-0103-03); (2) \"Formation Conditions, Exploration Potential and Breakthrough Direction of Large and Medium-sized Gas Fields in the South China Sea\" Fund project of China National Offshore Oil Co., Ltd. (No. KJZH-2021-0003-00); (3) Research on Key Technologies for Producing 20 million Tons of Oil in the Eastern South China Sea (No. CNOOC-KJ 135 ZDXM 37 SZ 01 SHENHAI), a major science and technology project of CNOOC's Seven-Year Action Plan; (4) China National Offshore Oil Co., Ltd. \"Shallow Gas Formation Mechanism and Exploration Key Technologies in the Eastern South China Sea\" project (No. SCKY-2022-SHENHAI-05). **Institutional Review Board Statement:** Not applicable. **Informed Consent Statement:** Not applicable. **Data Availability Statement:** The original contributions presented in the study are included in the article, further inquiries can be directed to the corresponding author.