Analysis on enrichment factors of lithologic reservoir at Wangchang Eq4_2~3 block in Qianjiang depression

The formation,distribution and enrichment of lithologic reservoir at Qianjiang formation in Qianjiang depression are controlled by many factors,so the enrichment degree is vari-ent in different horizon or area,of which Wangchang Eq432 sand series is most enriched.Through fine dissecting the tectonic setting,oil and gas forming condition,it is sugges-ted that Wangchang block has good "old descent and present rise" reservoir-forming background.The old descent is fa-vorable to the extending of delta front of Eq423 sand series,while the present rise is good to capture oil.Meanwhile,it owns superior reservoir-forming condition,which closed to Banghu oil depression on plane,and near to oil generative as-semblage vertically,with developed sand sheet reservoir,with a duplexing dredge system and good time-space deploy relation.The original summarized the enrichment factor of Wangchang Eq432 lithologic reservoir,that is " four-ele-ment" reservoir controlling.That is,the hydrocarbon rock controls the distribution of oil and gas,the structural setting and tectonic setting decides the scale of the reservoir,the transforming system is the key to the concentrated of lithol-ogic deposit,the interface physical property of the sand is an inhesion controlling factor to oil filled,and oil will enrich when the "four-element" is good.