Well Luntan 1 in the Lunnan area of the Tarim Basin has made a major breakthrough in the dolomites of the Lower Cambrian platform margin zone at a depth of more than 8 000 m, which proves that the Cambrian platform margin zone has developed high-quality source-reservoir-cap assemblages and is an important oil and gas exploration field in the deep layers of the Tarim Basin. Based on petrology, isotope stratigraphic comparison and seismic facies analysis, it is believed that the Cambrian platform margin belt in Lunnan area has experienced the sedimentary evolution process from the early carbonate gentle slope to the middle-late rimmed platform, forming multiple sets of high quality Cambrian subsalt source-reservoir-caprock assemblage. The Lower Cambrian Yuertus Formation was developed in mud-rich middle gentle slope outer zone-outer gentle slope in relatively deep water, and a set source rock of 20-30 m was developed in the formation. The Lower Cambrian Xiaoerbulak Formation was developed in middle gentle slope outer zone with limes depositing on it, and tidal flats and granular shoal dolomite reservoirs developed locally in high structural positions. In the Wusonggeer period of Early Cambrian, 8-10 km wide mound-shoal reservoir was developed in weak-rimmed margin. During the Middle Cambrian, strong-rimmed platform margin with a width of 4-5 km was developed; 5-8 km wide argillaceous dolomite of gypsum dolomite flat-argillaceous dolomite flat facies and 10-15 km wide gypsum-salt rock of gypsum salt lake-salt lake facies were developed in platform interior, which formed two kinds of high quality cap rock. It is pointed out that the most realistic exploration field in the Lunnan area is the reservoir-cap assemblage of the granular shoal reservoir in weak-rimmed platform margin and behind the reef of Wusonggeer Formation and gypsum-salt cap rock of Middle Cambrian. It is worth exploring for the reservoir-cap assemblage of the inter-salt granular shoal in the Middle Cambrian Shayilik Formation. The dolomite strata in the upper part of the Xiaoerbulak Formation in the high part of the paleostructure still have exploration potential.